var dLAT=0;
var dLNG=1;

// the following is an array of NAD83-NAD27 grid shift values in decimal degrees
// this code is generated by a program that uses proj4 to calculate the shifts for
//    a regular grid of the continental U.S.
// the array is three-dimensional, dLatLng[x][y][z], but the z dimension is only 
//    2 deep -- latitude and longitude for each x,y point
// x coordinates are longitude, west negative, with the origin at the eastern 
//    most point of the grid (e.g., 66 degrees W)
// y coordinates are latitude, north positive, with the origin at the southern
//    most point of the grid (e.g., 26 degrees N)
// z coordinates are z[0] = latitude shift, z[1] = longitude shift
// the shift value is defined as shift = nad83-nad27
//    where all values are signed (west negative, south negative) decimal degrees

//-------------------------included software-generated code---------------------


var EASTLNG=-66;
var WESTLNG=-124;
var SOUTHLAT=25;
var NORTHLAT=50;
var SPACING=1.0

dLatLng = new Array(
[ [-0.00044277,-0.00102600],[-0.00042369,-0.00100244],[-0.00040457,-0.00097924],[-0.00038540,-0.00095639],[-0.00036619,-0.00093386],[-0.00034695,-0.00091161],[-0.00032769,-0.00088958],[-0.00030842,-0.00086772],[-0.00028919,-0.00084598],[-0.00027003,-0.00082432],[-0.00025103,-0.00080272],[-0.00023225,-0.00078119],[-0.00021381,-0.00075972],[-0.00019580,-0.00073835],[-0.00017825,-0.00071709],[-0.00016114,-0.00069601],[-0.00014431,-0.00067532],[-0.00012769,-0.00065563],[-0.00011117,-0.00063796],[-0.00009360,-0.00062501],[-0.00007787,-0.00061531],[-0.00006526,-0.00059764],[-0.00005195,-0.00058265],[-0.00003557,-0.00056600],[-0.00001664,-0.00054421],[0.00000306,-0.00051829] ],
[ [-0.00043743,-0.00098771],[-0.00041823,-0.00096397],[-0.00039894,-0.00094067],[-0.00037959,-0.00091779],[-0.00036017,-0.00089527],[-0.00034071,-0.00087307],[-0.00032124,-0.00085114],[-0.00030177,-0.00082943],[-0.00028235,-0.00080787],[-0.00026303,-0.00078644],[-0.00024389,-0.00076515],[-0.00022502,-0.00074401],[-0.00020659,-0.00072306],[-0.00018874,-0.00070230],[-0.00017150,-0.00068167],[-0.00015496,-0.00066109],[-0.00013878,-0.00064037],[-0.00012243,-0.00061988],[-0.00010615,-0.00060172],[-0.00008936,-0.00058767],[-0.00007863,-0.00057780],[-0.00006235,-0.00056576],[-0.00005327,-0.00055546],[-0.00003596,-0.00054154],[-0.00001515,-0.00051908],[0.00000547,-0.00049200] ],
[ [-0.00043210,-0.00094826],[-0.00041272,-0.00092427],[-0.00039321,-0.00090082],[-0.00037359,-0.00087788],[-0.00035389,-0.00085539],[-0.00033415,-0.00083328],[-0.00031441,-0.00081148],[-0.00029471,-0.00078995],[-0.00027507,-0.00076863],[-0.00025556,-0.00074751],[-0.00023626,-0.00072661],[-0.00021727,-0.00070601],[-0.00019881,-0.00068579],[-0.00018109,-0.00066600],[-0.00016414,-0.00064657],[-0.00014856,-0.00062725],[-0.00013348,-0.00060697],[-0.00011717,-0.00058597],[-0.00010078,-0.00056505],[-0.00008633,-0.00055473],[-0.00007090,-0.00054743],[-0.00005444,-0.00053592],[-0.00004324,-0.00053066],[-0.00003399,-0.00051450],[-0.00001335,-0.00049301],[0.00000854,-0.00046523] ],
[ [-0.00042680,-0.00090723],[-0.00040716,-0.00088291],[-0.00038734,-0.00085928],[-0.00036737,-0.00083629],[-0.00034730,-0.00081385],[-0.00032720,-0.00079187],[-0.00030714,-0.00077028],[-0.00028716,-0.00074901],[-0.00026732,-0.00072802],[-0.00024763,-0.00070728],[-0.00022816,-0.00068686],[-0.00020900,-0.00066691],[-0.00019044,-0.00064762],[-0.00017274,-0.00062917],[-0.00015593,-0.00061159],[-0.00014221,-0.00059459],[-0.00012892,-0.00057569],[-0.00011149,-0.00055682],[-0.00009579,-0.00053336],[-0.00008201,-0.00051697],[-0.00006721,-0.00051748],[-0.00004511,-0.00050845],[-0.00003759,-0.00051598],[-0.00003481,-0.00048207],[-0.00001023,-0.00046663],[0.00001315,-0.00043723] ],
[ [-0.00042157,-0.00086410],[-0.00040159,-0.00083938],[-0.00038134,-0.00081557],[-0.00036089,-0.00079256],[-0.00034035,-0.00077024],[-0.00031980,-0.00074849],[-0.00029935,-0.00072722],[-0.00027908,-0.00070634],[-0.00025906,-0.00068579],[-0.00023927,-0.00066556],[-0.00021968,-0.00064570],[-0.00020037,-0.00062646],[-0.00018155,-0.00060820],[-0.00016381,-0.00059128],[-0.00014672,-0.00057576],[-0.00013552,-0.00056211],[-0.00012823,-0.00054502],[-0.00010354,-0.00053261],[-0.00009434,-0.00051791],[-0.00007835,-0.00050290],[-0.00005642,-0.00049272],[-0.00003361,-0.00048761],[-0.00003644,-0.00047716],[-0.00002624,-0.00046070],[-0.00000213,-0.00044001],[0.00001953,-0.00040537] ],
[ [-0.00041647,-0.00081831],[-0.00039603,-0.00079313],[-0.00037523,-0.00076916],[-0.00035417,-0.00074622],[-0.00033301,-0.00072415],[-0.00031189,-0.00070278],[-0.00029098,-0.00068200],[-0.00027042,-0.00066170],[-0.00025032,-0.00064180],[-0.00023057,-0.00062222],[-0.00021102,-0.00060302],[-0.00019168,-0.00058448],[-0.00017250,-0.00056723],[-0.00015466,-0.00055174],[-0.00013730,-0.00053826],[-0.00012358,-0.00052745],[-0.00011447,-0.00052321],[-0.00010067,-0.00051249],[-0.00008729,-0.00049745],[-0.00007008,-0.00048702],[-0.00005030,-0.00048406],[-0.00004149,-0.00046077],[-0.00003130,-0.00044748],[-0.00001287,-0.00043172],[0.00000688,-0.00040254],[0.00002605,-0.00036816] ],
[ [-0.00041160,-0.00076923],[-0.00039057,-0.00074357],[-0.00036905,-0.00071952],[-0.00034722,-0.00069682],[-0.00032529,-0.00067518],[-0.00030348,-0.00065441],[-0.00028202,-0.00063435],[-0.00026116,-0.00061491],[-0.00024109,-0.00059594],[-0.00022163,-0.00057730],[-0.00020248,-0.00055888],[-0.00018340,-0.00054101],[-0.00016404,-0.00052463],[-0.00014563,-0.00051065],[-0.00012958,-0.00049990],[-0.00011293,-0.00048804],[-0.00010222,-0.00048332],[-0.00009694,-0.00048138],[-0.00008098,-0.00047437],[-0.00006631,-0.00046870],[-0.00004633,-0.00045880],[-0.00003251,-0.00044225],[-0.00001886,-0.00041816],[-0.00000336,-0.00039168],[0.00001354,-0.00036178],[0.00003278,-0.00032897] ],
[ [-0.00040707,-0.00071626],[-0.00038530,-0.00069017],[-0.00036289,-0.00066622],[-0.00034011,-0.00064400],[-0.00031725,-0.00062308],[-0.00029461,-0.00060317],[-0.00027248,-0.00058412],[-0.00025126,-0.00056587],[-0.00023131,-0.00054827],[-0.00021246,-0.00053098],[-0.00019456,-0.00051369],[-0.00017657,-0.00049640],[-0.00015680,-0.00048050],[-0.00013739,-0.00046831],[-0.00012397,-0.00046173],[-0.00011053,-0.00045101],[-0.00009911,-0.00045272],[-0.00009472,-0.00045026],[-0.00007862,-0.00045283],[-0.00006191,-0.00044113],[-0.00004199,-0.00042866],[-0.00002726,-0.00040356],[-0.00001292,-0.00037612],[0.00000257,-0.00034921],[0.00002023,-0.00031961],[0.00003977,-0.00028743] ],
[ [-0.00040308,-0.00065893],[-0.00038037,-0.00063253],[-0.00035688,-0.00060901],[-0.00033298,-0.00058765],[-0.00030906,-0.00056781],[-0.00028545,-0.00054906],[-0.00026250,-0.00053131],[-0.00024077,-0.00051460],[-0.00022084,-0.00049888],[-0.00020291,-0.00048353],[-0.00018830,-0.00046878],[-0.00017320,-0.00045169],[-0.00015162,-0.00043437],[-0.00012852,-0.00042365],[-0.00011849,-0.00042389],[-0.00011777,-0.00042172],[-0.00009751,-0.00041723],[-0.00009192,-0.00041740],[-0.00007503,-0.00042910],[-0.00006081,-0.00041198],[-0.00004468,-0.00039837],[-0.00002499,-0.00035404],[-0.00000901,-0.00033111],[0.00000794,-0.00030512],[0.00002618,-0.00027650],[0.00004561,-0.00024591] ],
[ [-0.00039980,-0.00059698],[-0.00037597,-0.00057058],[-0.00035118,-0.00054799],[-0.00032602,-0.00052808],[-0.00030096,-0.00050977],[-0.00027636,-0.00049246],[-0.00025247,-0.00047616],[-0.00022997,-0.00046124],[-0.00020962,-0.00044790],[-0.00019211,-0.00043505],[-0.00018294,-0.00042832],[-0.00017489,-0.00040842],[-0.00014995,-0.00038660],[-0.00012122,-0.00037485],[-0.00011245,-0.00037879],[-0.00011217,-0.00038522],[-0.00009726,-0.00038157],[-0.00008805,-0.00039107],[-0.00007043,-0.00039974],[-0.00006414,-0.00036853],[-0.00004422,-0.00034266],[-0.00002486,-0.00030888],[-0.00000616,-0.00028752],[0.00001191,-0.00026231],[0.00003054,-0.00023499],[0.00005019,-0.00020580] ],
[ [-0.00039750,-0.00053060],[-0.00037229,-0.00050472],[-0.00034597,-0.00048387],[-0.00031940,-0.00046620],[-0.00029326,-0.00045000],[-0.00026786,-0.00043430],[-0.00024318,-0.00041933],[-0.00021972,-0.00040614],[-0.00019866,-0.00039543],[-0.00017956,-0.00038591],[-0.00016998,-0.00037979],[-0.00015756,-0.00035998],[-0.00014573,-0.00034695],[-0.00012350,-0.00034346],[-0.00011251,-0.00033729],[-0.00010282,-0.00032620],[-0.00008346,-0.00035216],[-0.00007499,-0.00035655],[-0.00006618,-0.00035787],[-0.00005800,-0.00035236],[-0.00004553,-0.00029128],[-0.00002240,-0.00027378],[-0.00000280,-0.00025037],[0.00001501,-0.00022395],[0.00003363,-0.00019688],[0.00005349,-0.00016836] ],
[ [-0.00039644,-0.00046060],[-0.00036954,-0.00043605],[-0.00034138,-0.00041809],[-0.00031327,-0.00040379],[-0.00028626,-0.00039040],[-0.00026058,-0.00037630],[-0.00023580,-0.00036208],[-0.00021143,-0.00035009],[-0.00019048,-0.00034240],[-0.00017300,-0.00033652],[-0.00015889,-0.00033138],[-0.00015886,-0.00032305],[-0.00015103,-0.00031709],[-0.00013514,-0.00030731],[-0.00011000,-0.00030138],[-0.00009555,-0.00029971],[-0.00008344,-0.00031108],[-0.00007421,-0.00031208],[-0.00006307,-0.00030963],[-0.00005399,-0.00027800],[-0.00003408,-0.00025892],[-0.00001714,-0.00024626],[-0.00000100,-0.00021786],[0.00001611,-0.00018940],[0.00003502,-0.00016212],[0.00005537,-0.00013392] ],
[ [-0.00039697,-0.00038864],[-0.00036793,-0.00036662],[-0.00033758,-0.00035311],[-0.00030764,-0.00034359],[-0.00027997,-0.00033396],[-0.00025501,-0.00032122],[-0.00023118,-0.00030645],[-0.00020542,-0.00029408],[-0.00018382,-0.00029061],[-0.00017300,-0.00028833],[-0.00016599,-0.00029151],[-0.00015299,-0.00029143],[-0.00014994,-0.00027384],[-0.00014009,-0.00027966],[-0.00010819,-0.00028128],[-0.00008730,-0.00027566],[-0.00005666,-0.00027144],[-0.00006684,-0.00027443],[-0.00006091,-0.00026589],[-0.00005063,-0.00025668],[-0.00003360,-0.00024014],[-0.00001777,-0.00021377],[-0.00000194,-0.00018415],[0.00001547,-0.00015736],[0.00003479,-0.00013030],[0.00005585,-0.00010236] ],
[ [-0.00039963,-0.00031653],[-0.00036753,-0.00029849],[-0.00033493,-0.00029162],[-0.00030226,-0.00028878],[-0.00027364,-0.00028461],[-0.00025126,-0.00027298],[-0.00023003,-0.00025578],[-0.00020104,-0.00023932],[-0.00017080,-0.00023797],[-0.00016990,-0.00024415],[-0.00016355,-0.00024810],[-0.00014225,-0.00026791],[-0.00013974,-0.00026274],[-0.00013728,-0.00025313],[-0.00010948,-0.00024813],[-0.00007892,-0.00025224],[-0.00006449,-0.00024352],[-0.00005950,-0.00023611],[-0.00005639,-0.00023638],[-0.00004657,-0.00022094],[-0.00003249,-0.00019942],[-0.00001878,-0.00017566],[-0.00000400,-0.00015201],[0.00001321,-0.00012688],[0.00003315,-0.00010031],[0.00005532,-0.00007310] ],
[ [-0.00040558,-0.00024220],[-0.00036804,-0.00023689],[-0.00033443,-0.00023850],[-0.00029684,-0.00024212],[-0.00026597,-0.00024688],[-0.00024905,-0.00023666],[-0.00023412,-0.00021630],[-0.00020509,-0.00019015],[-0.00017242,-0.00019307],[-0.00015879,-0.00020702],[-0.00015321,-0.00021954],[-0.00013694,-0.00023860],[-0.00013902,-0.00024249],[-0.00012398,-0.00021813],[-0.00010240,-0.00020014],[-0.00007377,-0.00022558],[-0.00006333,-0.00022166],[-0.00005470,-0.00022589],[-0.00005455,-0.00020152],[-0.00004129,-0.00018065],[-0.00003008,-0.00016216],[-0.00001989,-0.00014265],[-0.00000704,-0.00012067],[0.00000991,-0.00009703],[0.00003072,-0.00007218],[0.00005436,-0.00004599] ],
[ [-0.00040734,-0.00020395],[-0.00037077,-0.00020933],[-0.00033242,-0.00021255],[-0.00029865,-0.00021497],[-0.00026437,-0.00022179],[-0.00024689,-0.00021360],[-0.00023742,-0.00019374],[-0.00021445,-0.00016557],[-0.00016098,-0.00017427],[-0.00015606,-0.00018683],[-0.00014724,-0.00020016],[-0.00013294,-0.00020084],[-0.00011872,-0.00019420],[-0.00011296,-0.00018031],[-0.00008555,-0.00016861],[-0.00007122,-0.00018043],[-0.00005833,-0.00018582],[-0.00004930,-0.00018023],[-0.00004292,-0.00015715],[-0.00003260,-0.00014009],[-0.00002625,-0.00012470],[-0.00002145,-0.00010793],[-0.00001090,-0.00008921],[0.00000608,-0.00006856],[0.00002823,-0.00004555],[0.00005379,-0.00002057] ],
[ [-0.00041226,-0.00017585],[-0.00037557,-0.00018309],[-0.00033617,-0.00019059],[-0.00030063,-0.00019465],[-0.00025966,-0.00019198],[-0.00024000,-0.00017356],[-0.00022951,-0.00016179],[-0.00019944,-0.00015947],[-0.00015458,-0.00015965],[-0.00012842,-0.00015950],[-0.00011917,-0.00017194],[-0.00012638,-0.00016194],[-0.00011039,-0.00015128],[-0.00010003,-0.00015030],[-0.00007877,-0.00013838],[-0.00006733,-0.00014233],[-0.00005590,-0.00013131],[-0.00003459,-0.00013407],[-0.00003214,-0.00010746],[-0.00002140,-0.00009842],[-0.00002116,-0.00008568],[-0.00002437,-0.00007300],[-0.00001490,-0.00005758],[0.00000286,-0.00004054],[0.00002692,-0.00001998],[0.00005492,0.00000339] ],
[ [-0.00041709,-0.00015189],[-0.00037497,-0.00015774],[-0.00033379,-0.00016579],[-0.00029494,-0.00016925],[-0.00025000,-0.00016118],[-0.00022698,-0.00014787],[-0.00020675,-0.00013422],[-0.00017759,-0.00013096],[-0.00015223,-0.00013244],[-0.00011306,-0.00013444],[-0.00008771,-0.00013096],[-0.00010075,-0.00012668],[-0.00009188,-0.00011587],[-0.00008793,-0.00011065],[-0.00007128,-0.00010142],[-0.00006463,-0.00009463],[-0.00005620,-0.00008826],[-0.00004469,-0.00008276],[-0.00002750,-0.00006528],[-0.00001428,-0.00005322],[-0.00001524,-0.00004296],[-0.00002396,-0.00003170],[-0.00001562,-0.00002433],[0.00000246,-0.00001305],[0.00002889,0.00000520],[0.00005964,0.00002634] ],
[ [-0.00039888,-0.00015232],[-0.00036272,-0.00014102],[-0.00032277,-0.00013761],[-0.00028252,-0.00013429],[-0.00024331,-0.00012622],[-0.00020994,-0.00011680],[-0.00018789,-0.00010549],[-0.00017119,-0.00010002],[-0.00013108,-0.00008918],[-0.00010238,-0.00009359],[-0.00008417,-0.00009375],[-0.00008111,-0.00009000],[-0.00009082,-0.00007046],[-0.00007962,-0.00007687],[-0.00006589,-0.00006788],[-0.00005917,-0.00006472],[-0.00005222,-0.00005604],[-0.00004433,-0.00005756],[-0.00002997,-0.00003561],[-0.00002065,-0.00000687],[-0.00000866,-0.00000097],[-0.00001919,0.00000631],[-0.00001249,0.00000838],[0.00000660,0.00001726],[0.00003738,0.00003167],[0.00007043,0.00004835] ],
[ [-0.00038193,-0.00014653],[-0.00034973,-0.00012629],[-0.00031273,-0.00011463],[-0.00027325,-0.00010600],[-0.00023651,-0.00009618],[-0.00020252,-0.00008673],[-0.00018533,-0.00007129],[-0.00015729,-0.00007191],[-0.00012550,-0.00006320],[-0.00010047,-0.00005439],[-0.00007559,-0.00005250],[-0.00006779,-0.00004350],[-0.00006929,-0.00004748],[-0.00007369,-0.00004717],[-0.00005792,-0.00004709],[-0.00004626,-0.00003625],[-0.00004823,-0.00003247],[-0.00004788,-0.00003346],[-0.00003255,0.00000365],[-0.00001865,0.00003157],[-0.00000680,0.00004983],[-0.00001098,0.00006339],[-0.00001999,0.00008191],[0.00001889,0.00006711],[0.00005719,0.00005960],[0.00008914,0.00006805] ],
[ [-0.00036628,-0.00013997],[-0.00033656,-0.00011206],[-0.00030281,-0.00009309],[-0.00026763,-0.00008016],[-0.00023455,-0.00007165],[-0.00020770,-0.00006311],[-0.00018055,-0.00006224],[-0.00015189,-0.00004573],[-0.00012141,-0.00003382],[-0.00009759,-0.00002838],[-0.00008411,-0.00001832],[-0.00006101,-0.00001122],[-0.00004905,-0.00001977],[-0.00007351,-0.00003552],[-0.00005225,-0.00001814],[-0.00003583,-0.00001611],[-0.00004334,-0.00000666],[-0.00004531,0.00000914],[-0.00002252,0.00004506],[-0.00000851,0.00006966],[0.00000724,0.00009361],[0.00002255,0.00012405],[0.00002547,0.00016587],[0.00005854,0.00010655],[0.00008958,0.00007832],[0.00011368,0.00008169] ],
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[ [-0.00023188,0.00045778],[-0.00021201,0.00049135],[-0.00019175,0.00052616],[-0.00017095,0.00056038],[-0.00014911,0.00059185],[-0.00012732,0.00061817],[-0.00010936,0.00063909],[-0.00008056,0.00064776],[-0.00006587,0.00066739],[-0.00004439,0.00067916],[-0.00001655,0.00069588],[0.00000237,0.00069545],[0.00000500,0.00070139],[0.00001392,0.00071478],[0.00002442,0.00072321],[0.00004305,0.00071869],[0.00005163,0.00073496],[0.00006147,0.00074438],[0.00007890,0.00076787],[0.00007625,0.00077456],[0.00006964,0.00077627],[0.00007101,0.00077948],[0.00004132,0.00078019],[0.00003144,0.00078850],[-0.00001127,0.00079394],[-0.00004717,0.00078558] ],
[ [-0.00022849,0.00048710],[-0.00020855,0.00051956],[-0.00018819,0.00055348],[-0.00016711,0.00058719],[-0.00014538,0.00061872],[-0.00012208,0.00064587],[-0.00009968,0.00066845],[-0.00007338,0.00068219],[-0.00005192,0.00069579],[-0.00003549,0.00070915],[-0.00001619,0.00071724],[0.00001646,0.00072004],[0.00001505,0.00073531],[0.00001581,0.00075021],[0.00003934,0.00076517],[0.00004813,0.00077678],[0.00005666,0.00077610],[0.00007536,0.00078691],[0.00008264,0.00079708],[0.00008997,0.00080886],[0.00008039,0.00080230],[0.00007338,0.00082442],[0.00005697,0.00083235],[0.00003935,0.00084918],[0.00000331,0.00087861],[-0.00004429,0.00082855] ],
[ [-0.00022510,0.00051768],[-0.00020526,0.00054945],[-0.00018494,0.00058292],[-0.00016394,0.00061667],[-0.00014195,0.00064892],[-0.00011894,0.00067789],[-0.00009293,0.00070136],[-0.00006308,0.00072029],[-0.00004728,0.00073144],[-0.00002737,0.00074090],[-0.00001500,0.00074404],[0.00001693,0.00075472],[0.00001579,0.00077113],[0.00002816,0.00078505],[0.00004170,0.00078874],[0.00005668,0.00080484],[0.00006741,0.00081427],[0.00008156,0.00082148],[0.00009033,0.00083087],[0.00009788,0.00083791],[0.00007761,0.00086417],[0.00007516,0.00087646],[0.00006033,0.00088536],[0.00005044,0.00089498],[0.00001323,0.00092351],[-0.00003252,0.00088100] ],
[ [-0.00022148,0.00054884],[-0.00020189,0.00058021],[-0.00018187,0.00061354],[-0.00016120,0.00064764],[-0.00013965,0.00068090],[-0.00011680,0.00071157],[-0.00009334,0.00073627],[-0.00007006,0.00076581],[-0.00004049,0.00076722],[-0.00002210,0.00077422],[-0.00000639,0.00078359],[0.00001292,0.00079143],[0.00002442,0.00080062],[0.00003848,0.00080619],[0.00005223,0.00082082],[0.00006219,0.00083622],[0.00007395,0.00084216],[0.00008484,0.00084834],[0.00009336,0.00086211],[0.00008445,0.00087705],[0.00007612,0.00090085],[0.00007914,0.00091538],[0.00007602,0.00094320],[0.00004944,0.00094025],[0.00002176,0.00096067],[-0.00000762,0.00094666] ],
[ [-0.00021753,0.00058001],[-0.00019828,0.00061111],[-0.00017869,0.00064439],[-0.00015865,0.00067885],[-0.00013810,0.00071307],[-0.00011631,0.00074524],[-0.00009358,0.00077338],[-0.00007103,0.00079517],[-0.00004194,0.00080233],[-0.00001456,0.00080727],[0.00000250,0.00080885],[0.00002277,0.00082497],[0.00003380,0.00083878],[0.00004224,0.00084676],[0.00005772,0.00085074],[0.00006762,0.00086411],[0.00007670,0.00087986],[0.00009055,0.00088247],[0.00009877,0.00089741],[0.00009552,0.00091391],[0.00008782,0.00093416],[0.00008368,0.00094630],[0.00007918,0.00096486],[0.00005306,0.00097855],[0.00003296,0.00100020],[0.00000518,0.00099909] ],
[ [-0.00021323,0.00061089],[-0.00019429,0.00064164],[-0.00017514,0.00067471],[-0.00015573,0.00070925],[-0.00013599,0.00074395],[-0.00011603,0.00077698],[-0.00009564,0.00080599],[-0.00007821,0.00083299],[-0.00005363,0.00084169],[-0.00000445,0.00083303],[0.00001466,0.00084186],[0.00003370,0.00085446],[0.00004712,0.00086644],[0.00006293,0.00087641],[0.00006799,0.00088495],[0.00007433,0.00089626],[0.00008596,0.00091223],[0.00009824,0.00092959],[0.00010727,0.00092719],[0.00010665,0.00095212],[0.00010290,0.00095611],[0.00011244,0.00097655],[0.00009371,0.00098898],[0.00007518,0.00100858],[0.00004540,0.00103004],[-0.00000528,0.00104021] ],
[ [-0.00020863,0.00064135],[-0.00018986,0.00067154],[-0.00017097,0.00070412],[-0.00015193,0.00073832],[-0.00013258,0.00077286],[-0.00011320,0.00080579],[-0.00009238,0.00083484],[-0.00007203,0.00085294],[-0.00004463,0.00086428],[-0.00001484,0.00086100],[0.00002131,0.00087326],[0.00004854,0.00088379],[0.00006006,0.00089776],[0.00006504,0.00090580],[0.00007105,0.00091746],[0.00007862,0.00092587],[0.00009469,0.00094078],[0.00010916,0.00095775],[0.00012185,0.00096801],[0.00011451,0.00099471],[0.00012003,0.00099638],[0.00012587,0.00098245],[0.00010617,0.00100005],[0.00009819,0.00103157],[0.00006825,0.00107356],[-0.00001620,0.00108368] ],
[ [-0.00020381,0.00067145],[-0.00018507,0.00070083],[-0.00016623,0.00073261],[-0.00014721,0.00076613],[-0.00012780,0.00080014],[-0.00010790,0.00083277],[-0.00008666,0.00086145],[-0.00006261,0.00088371],[-0.00003710,0.00089377],[-0.00001193,0.00089899],[0.00002731,0.00090405],[0.00005541,0.00091128],[0.00006976,0.00092180],[0.00006912,0.00094020],[0.00007516,0.00095443],[0.00008603,0.00096559],[0.00009699,0.00097255],[0.00010766,0.00098550],[0.00012176,0.00100636],[0.00011949,0.00102192],[0.00013844,0.00105070],[0.00013889,0.00105045],[0.00012165,0.00105948],[0.00011371,0.00108334],[0.00008828,0.00110693],[-0.00000385,0.00113018] ],
[ [-0.00019891,0.00070135],[-0.00018010,0.00072970],[-0.00016118,0.00076042],[-0.00014201,0.00079298],[-0.00012240,0.00082626],[-0.00010194,0.00085860],[-0.00008031,0.00088785],[-0.00005754,0.00091124],[-0.00003555,0.00092685],[-0.00000896,0.00093163],[0.00003139,0.00093691],[0.00004712,0.00093391],[0.00005432,0.00094540],[0.00007531,0.00097812],[0.00008052,0.00098390],[0.00009201,0.00099710],[0.00010070,0.00100883],[0.00010644,0.00102254],[0.00012086,0.00103880],[0.00012636,0.00105489],[0.00012192,0.00108857],[0.00014437,0.00111583],[0.00013470,0.00111751],[0.00012494,0.00113414],[0.00009699,0.00115235],[0.00002009,0.00117084] ],
[ [-0.00019407,0.00073128],[-0.00017515,0.00075844],[-0.00015611,0.00078793],[-0.00013683,0.00081931],[-0.00011705,0.00085164],[-0.00009667,0.00088345],[-0.00007498,0.00091286],[-0.00005351,0.00093795],[-0.00003195,0.00095378],[-0.00000401,0.00096074],[0.00002251,0.00097441],[0.00004666,0.00096717],[0.00005270,0.00099346],[0.00007850,0.00101632],[0.00009164,0.00101495],[0.00009519,0.00103519],[0.00010303,0.00104306],[0.00011027,0.00105858],[0.00012605,0.00107286],[0.00013887,0.00109025],[0.00014386,0.00112997],[0.00014623,0.00115062],[0.00014616,0.00116501],[0.00013823,0.00118369],[0.00012319,0.00119964],[0.00005832,0.00120989] ],
[ [-0.00018938,0.00076149],[-0.00017036,0.00078741],[-0.00015125,0.00081555],[-0.00013188,0.00084561],[-0.00011210,0.00087684],[-0.00009177,0.00090806],[-0.00007061,0.00093778],[-0.00004871,0.00096443],[-0.00002504,0.00098665],[0.00000174,0.00100949],[0.00002229,0.00101877],[0.00003361,0.00102200],[0.00005450,0.00102876],[0.00007617,0.00105131],[0.00010312,0.00105458],[0.00010883,0.00106697],[0.00010954,0.00107726],[0.00011862,0.00108811],[0.00013446,0.00110089],[0.00015701,0.00112943],[0.00015624,0.00116363],[0.00015487,0.00118209],[0.00015824,0.00119186],[0.00016039,0.00121118],[0.00014471,0.00123656],[0.00011285,0.00124884] ],
[ [-0.00018487,0.00079226],[-0.00016581,0.00081694],[-0.00014666,0.00084367],[-0.00012731,0.00087230],[-0.00010765,0.00090229],[-0.00008750,0.00093274],[-0.00006679,0.00096249],[-0.00004558,0.00099028],[-0.00002420,0.00101547],[-0.00000288,0.00103683],[0.00001769,0.00105345],[0.00003338,0.00107116],[0.00005046,0.00107324],[0.00007861,0.00107247],[0.00010277,0.00107930],[0.00011961,0.00109669],[0.00012127,0.00111020],[0.00013224,0.00111929],[0.00014789,0.00113700],[0.00015927,0.00114865],[0.00015519,0.00119084],[0.00016414,0.00119687],[0.00017394,0.00122053],[0.00017918,0.00123958],[0.00015141,0.00125444],[0.00014139,0.00127495] ],
[ [-0.00018054,0.00082379],[-0.00016149,0.00084730],[-0.00014237,0.00087262],[-0.00012311,0.00089974],[-0.00010362,0.00092833],[-0.00008381,0.00095771],[-0.00006371,0.00098698],[-0.00004324,0.00101514],[-0.00002254,0.00104124],[-0.00000275,0.00106440],[0.00001533,0.00108337],[0.00003182,0.00109675],[0.00005093,0.00110716],[0.00007114,0.00110913],[0.00010349,0.00111030],[0.00012508,0.00112125],[0.00013687,0.00114433],[0.00014985,0.00115276],[0.00015853,0.00116697],[0.00015236,0.00119411],[0.00015832,0.00120719],[0.00016472,0.00122154],[0.00018125,0.00125452],[0.00018750,0.00128498],[0.00017177,0.00130559],[0.00016564,0.00131482] ],
[ [-0.00017636,0.00085619],[-0.00015735,0.00087865],[-0.00013831,0.00090262],[-0.00011918,0.00092822],[-0.00009991,0.00095527],[-0.00008048,0.00098331],[-0.00006087,0.00101163],[-0.00004115,0.00103934],[-0.00002174,0.00106551],[-0.00000238,0.00108916],[0.00001620,0.00110902],[0.00003425,0.00112501],[0.00005347,0.00113424],[0.00007256,0.00113875],[0.00009212,0.00113795],[0.00013362,0.00113809],[0.00015077,0.00117554],[0.00016666,0.00118885],[0.00016729,0.00120716],[0.00015535,0.00122659],[0.00017019,0.00122394],[0.00017069,0.00125170],[0.00018899,0.00128183],[0.00019375,0.00131400],[0.00018800,0.00132897],[0.00018633,0.00135340] ]
)

//-----------------------end included software-generated code-------------------


// bilinear interpolation calculation of grid shift
function nad83to27(lat,lng,latlng27)
{
    var xindex, yindex;
    if (lat<SOUTHLAT || lat>NORTHLAT || lng>EASTLNG || lng<WESTLNG) {
       //alert("No datum shift in this area");
       return 0;
    }
    xindex = Math.floor(Math.abs((Math.floor(lng)-EASTLNG))/SPACING)-1;
    yindex = Math.floor((Math.floor(lat)-SOUTHLAT)/SPACING);

    // compute longitude shift
    var Q11 = dLatLng[xindex+1][yindex][dLNG];
    var Q21 = dLatLng[xindex][yindex][dLNG];
    var Q12 = dLatLng[xindex+1][yindex+1][dLNG];
    var Q22 = dLatLng[xindex][yindex+1][dLNG];

    var x2 = Math.floor(lng);
    var x1 = x2-1;
    var y1 = Math.floor(lat);
    var y2 = y1+1;


    latlng27.lng = lng + (Q11/(x2-x1)*(y2-y1))*(x2-lng)*(y2-lat) + 
          (Q21/(x2-x1)*(y2-y1))*(lng-x1)*(y2-lat) + 
	  (Q12/(x2-x1)*(y2-y1))*(x2-lng)*(lat-y1) + 
          (Q22/(x2-x1)*(y2-y1))*(lng-x1)*(lat-y1);

    // compute latitude shift
    var Q11 = dLatLng[xindex+1][yindex][dLAT];
    var Q21 = dLatLng[xindex][yindex][dLAT];
    var Q12 = dLatLng[xindex+1][yindex+1][dLAT];
    var Q22 = dLatLng[xindex][yindex+1][dLAT];

    latlng27.lat = lat + (Q11/(x2-x1)*(y2-y1))*(x2-lng)*(y2-lat) + 
          (Q21/(x2-x1)*(y2-y1))*(lng-x1)*(y2-lat) + 
	  (Q12/(x2-x1)*(y2-y1))*(x2-lng)*(lat-y1) + 
          (Q22/(x2-x1)*(y2-y1))*(lng-x1)*(lat-y1);

    return;
}