A spatial operation in which two or more maps or layers registered to a common coordinate system are superimposed, either digitally or on a transparent material, for the purpose of showing the relationships between features that occupy the same geographic space.
5
votes
1answer
2k views
Can image layer be rotated in OpenLayers?
While working on Ground Overlays, I noticed that it has a tag called <rotation>
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
...
3
votes
1answer
161 views
Calculating the time taken to complete the overlay display in map?
Currently, I am able to calculate the server response time by logging the difference of current date to initialize the map with the time when layers is added. But this gives me server response time. ...
10
votes
1answer
375 views
Method to shade or overlay a raster map to reflect time of day and ambient light
I have a daytime raster of my study area.
I have 20+ counters in the study area that count "stuff" with a timestamp.
Using PyEphem I determined the type of ambient light for each collected data ...
5
votes
2answers
2k views
How to display image overlays in OpenLayers?
I am working on displaying Ground Overlays on OpenLayers by parsing KML manually.
To do so, I was trying to add an image on top of Google Map by looking at GroundOverlay section from ...
2
votes
2answers
718 views
Image display/scaling in OpenLayers vs Google Maps
When I plot an image on OpenLayers, it looks like that image is stretched a little bit as compared to Google Maps. I was wondering if it is normal or there is something wrong with my code.
...
4
votes
1answer
818 views
Does OpenLayers supports KML Ground Overlays?
I am not able to display Ground Overlays in a KML file with OpenLayers. Does OpenLayers supports KML Ground Overlays? If not, how would I proceed in writing my own code or plugin for OpenLayers so ...
4
votes
4answers
3k views
How to reproject base layers in OpenLayers?
The issue is:
I have vector/topo/image tiled maps for some places in north america which were published as ArcGIS Server REST service. These maps (A) are based in EPSG26912 projection. Now I wanna ...
3
votes
3answers
143 views
Is the Intersection Operation Commutative?
In map overlay, is intersection of map layers a commutative operation ie layer_A intersection layer_B = layer_B intersection layer_A?
If layer A is a square and layer B is a triangle. In this case, (A ...
2
votes
1answer
324 views
polygon map overlay algorithm
There are many algorithms for binary map overlay operation in vector data format which take two layers of map and produce resultant layer i.e overlaid layer as output.
I am wondering whether there are ...
6
votes
1answer
2k views
Openlayers wfs vector layer
I'm trying to add a vector layer with a wfs layer and it's not working.Can anyone point a solution?
Openlayers code:
var wfs = new OpenLayers.Layer.Vector(
"Stavros Features",
...
2
votes
0answers
248 views
Creating a sidewalk map for a walkability survey
If I wanted to do my own walkability survey of my city, what tools could I use? I have map data from OpenStreetMap, but I have to consider that streets have two sides (which aren't always accessible ...
1
vote
1answer
152 views
How to display Lidar Data in ee0 (Interchange File) on Maps
Hi I have Lidar data in ee0 files (interchange files). Can i ovaerlay them on some maps like say Bing Maps or Geoserver with Open Layers?
If yes whats the right way of doing it?
Thanks
5
votes
2answers
506 views
BBOX and Projections of WMS services in Geoserver
we have tried to overlay a raster layer on Google map and have some difficulties to align the raster images onto the base map. When it is on the overview (Zoom level 1), it looks like this:
On a ...
1
vote
1answer
226 views
Is Tile same as Layer?
Is there difference between a tile server or a layer server?
Can I load tile in ArcGIS control in WPF from some other source?
Can I host my own layer server? Or is there any such thing as layer ...
1
vote
1answer
314 views
Text ShapeFile not displaying ArcGIS/ArcMap
I currently am trying to load different shp files in ArcObjects progromatically. Currently I can load lines,polylines, polygons and ellipses (even though that's just a fancy polygon as far as ...
6
votes
1answer
2k views
Draw route direction overlay on Google Maps or OpenLayers
I'd like to display the route direction generated from GraphServer on either Google Map or OpenLayers. The result I want is basically identical to how Google Map shows route directions, by ...
3
votes
1answer
1k views
OpenLayers doesn't show an overlay with a different SRS than the base layer
I need to add an overlay layer that uses EPSG:4326 to a map with a base layer that uses EPSG:32628.
Every time I add the overlay OpenLayers automatically switches the SRS param of the overlay to ...
5
votes
7answers
988 views
Problem with Swiss coordinate system overlay in WMS
I have administrative boundaries data for communities in Switzerland from SwissTopo. Original data came in shape files with 'Bessel 1841 Hotine Oblique Mercator Azimuth Natural Origin' projection.
...
8
votes
1answer
1k views
How do I create an animation in google earth using png overlays with kml timestamps?
I have the following kml files, each with a different timestamp and png:
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2"
...
