Top new questions this week:

How do GPS/Glonass/Galileo satellite know their position?

We use satellites to calculate our position. How do satellites know their position if it is right or wrong ? I have heard that the base station records and corrects the satellite path but how do they …

gps

asked by Abhijit Gujar 9 votes answered by radouxju 9 votes

How to change the "W" (English) to "O"(French) on the North Arrow direction using ArcMAP 10.0?

How to change the "W" (English) to "O"(French) on the North Arrow direction using ArcMAP 10.0? I tried to convert the North Arrow sign to graphic but it didn't work.

arcgis-10.0 arcgis-desktop

asked by Doum 7 votes answered by DPierce 2 votes

Can I just swap out a .prj file to reproject a shape file?

I'm an experienced software developer -- but a GIS noob. I have a shape file that I am trying to turn into a SVG map with Kartograph. When I try to run Kartograph I get this error: ERROR 6: No …

shapefile projection coordinate-system

asked by akh2103 7 votes answered by mwalker 8 votes

Recommended programming language for remote sensing?

I am beginning studies that hopefully will lead to a long career as a remote sensing specialist. I am currently working with ArcGIS for some applications and learning ENVI for others. I have …

python remote-sensing idl

asked by Emily 6 votes answered by Jeffrey Evans 8 votes

How do I contact the developer of a QGIS plugin?

I want to give feedback to the developer of a non-core QGIS plugin. (Numerical Vertex Edit by Cedric Moeri, who seems to have no webpage for his plugins) I joined OSGeo Wiki but hardly know my way …

qgis

asked by IanS 5 votes answered by BradHards 5 votes

Maximum number of layers in openlayers with geoext

i have been developing webgis application that requires around 45 different layers served from geoserver. I had created openlayers wms layers and added them to geoext, everything works fine till the …

openlayers geoserver geoext extjs geoext2

asked by Bishrant 4 votes answered by Sorin Călinică 1 vote

Easily calculate "roundness/compactness" of a polygon

I am trying to find ways to quantitatively describe the shapes of various polygons. For my project, these polygons represent lakes, rivers, lagoons, and parks. So they can be almost any shape. One …

arcgis-desktop arcgis-10.1 polygon

asked by user25201 4 votes answered by radouxju 5 votes

Greatest hits from previous weeks:

Whether to use File Geodatabase (*.gdb), Personal Geodatabase (*.mdb) or shapefiles?

I am a bit confused on the topic of geodatabases. Previously, I have used geodatabases as an easy way to keep all files together rather than having dozens of shapefiles all over the place. And it's …

arcgis-desktop shapefile file-geodatabase personal-geodatabase

asked by Martin 26 votes answered by PolyGeo 30 votes

What is difference between map layer and spatial dataset (e.g. feature class, shapefile)?

This may be very trivial question. To me they seems very similar in concept. What is the difference between feature class and feature layer?

arcgis-desktop layers features feature-layer feature-class

asked by user 21 votes answered by Thomas 19 votes

Can you answer these?

How to add an offset to a GeoJSON layer in Leaflet?

Using the example GeoJSON tutorial code at leafletjs.com. Change the myLines variable so that the two lines overlap, but run in opposite directions as follows: var myLines = [{ "type": …

qgis arcmap leaflet geojson linestring

asked by Brian D 2 votes

JSONP working with Geoserver and OpenLayers

I'm in this scenario (fighting with the same origin police issue): I have a map initialized with OpenLayers and a WFS request trough the Protocol.Script object that is giving me this error: …

openlayers geoserver google-maps wfs geojson

asked by halbano 1 vote

How to enforce labels for all polygons?

I am trying to label polygons but it does not always work. Either the polygon is quite large, then the label appears, or the polygon is small, then the label is not displayed. I've already tried to …

polygon labeling qgis-2.0

asked by stephane M 1 vote