Geocoder to get Township, Section, USGS Quad by Lat/Long

GIS Geocoder allows for the conversion of Latitude and Longitude (Lat/Long) values into State, County, Township, Range, Section and USGS Quad (Texas: Abstract, Block, Grantee).

For detail, please contact costudio.

Mobile GIS (GIS on PDA)

mobile GIS and field mapping application running on Windows Mobile/Pocket PC/Smart Phone

• Sql Server CE


• GPS: Bluetooth enabled


• Sync with RDA/Replication

Features:

• Google Map supported


• Custom Map Processing to fit on PDA


• Auto GPS reading as walk


• Drawing polygon, polyline and point on map


• support shape view, map view and data view


• UTM grid on map


• data format with Geographic/UTM


• Geographic and UTM data converter


• Export to KML, CSV


• GPS signal indicator

information from EnvironmentalStudio.net

Check if Point in Polygon with javascript

function inPoly(poly,px,py)
{
var npoints = poly.length; // number of points in polygon
var xnew,ynew,xold,yold,x1,y1,x2,y2,i;
var inside=false;
if (npoints/2 < 3) { // points don't describe a polygon
return false;
}
xold=poly[npoints-2];
yold=poly[npoints-1];

for (i=0 ; i < npoints ; i=i+2) {
xnew=poly[i];
ynew=poly[i+1];
if (xnew > xold) {
x1=xold;
x2=xnew;
y1=yold;
y2=ynew;
}
else {
x1=xnew;
x2=xold;
y1=ynew;
y2=yold;
}
if ((xnew < px) == (px <= xold) && ((py-y1)*(x2-x1) < (y2-y1)*(px-x1))) {
inside=!inside;
}
xold=xnew;
yold=ynew;
}
return inside;
}