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I'm working on a Webservice where GIS supports my services as a Crowd Intelligence Aggregator to help civilian (like civilized) aid to support provisioners in a case of emergency, e.g. pestilence, military/civil conflict or other natural planet-bound catastrophies like earthquakes. Example:I...

I am looking for a Python script that does the following: Uses a point (from a point shapefile) as the origin. Creates about 3 km line from point Based on an azimuth provided in the original point shapefile. Creates new entry in another shapefile with the new line I imagine this involves...

I have few data in which ArcGIS Java Script version 2.6 and 2.8 is used & I am upgrading it to ver.3.0/3.1 and getting different errors like (Store error,Map display is blank etc.) I searched on Google and ArcGIS Forum also following this article still getting an errors also I refereed few...

I am having problems in ArcObjects. I am struggling to get to the individual (feature-)layers inside a GroupLayer. Does anyone know how to do that ? أكثر...

I'm trying to load a GeoJSON file with about 5K features in QGIS, and it fails, saying Invalid Data Source without further details. If I remove features down to 1K, it works. Is there a limit on the size of GeoJSON files that can be handled by QGIS? How can I understand what's going on? I'm...

Satellites can help farmers make the most of the limited water resources at a farm in the Arabian Desert. أكثر...

I'm developing a tool that, when the user creates a feature in a certain feature class, prompts the user with a form to populate one of the fields in its attribute table. I'd like to have the user use the Editor sketch tool to create the feature, rather than creating my own implementation of the...

Do you know how to used template with a saved locator Map in Arcgis 10.1 ? I create my template and saved it but I don't know how to use always the same locator map (empty when I apply the template). I want to have in same template : a main map and a small locator map where the user can zoom...

By default, PostGIS calculates the Envelope or Extent of a polygon based on the bounding box of the polygon ((MINX, MINY), (MINX, MAXY), (MAXX, MAXY), (MAXX, MINY), (MINX, MINY)). This gives a result like so: However, I'm looking for a result more like this: As far as I know, the best...

We try to calculate catchments with the r.water.outlet function from python console. To do so we use the following code: import processingrlayer = QgsRasterLayer("/my/path/DrainageDirection.tif", "DrainageDirection")processing.runalg("grass:r.water.outlet", rlayer , 2621378.611131...

I.m new to GIS and mapping. Using QGIS. I desperately need help. My issue is the following: Have an excel with 4 columns (Region; District; village; number of cases)Have a shapefile with dots for villages with many columns including (Region ; District ;Village) I want to plot the cases on the...

Im working with many raster files, and I wanna ask if is there any chance to make virtual raster with average values in each pixel. (QGIS) Its for NDVI index in summer months for time horizont 5 years أكثر...

I'm trying to use Moran.test on a SpatialPolygonDataFrame consisting of 7194 elements in R. I know that there is around 150 polygons with NA values. First I generate a spatial weights matrix: W_cont_msoa moran.test(residuals, listw=W_cont_msoa_mat, zero.policy=T, na.rm=TRUE)Error in...

while i'm adding a geometry column in postgis by using AddGeometryColumn then the error is no function matches the given name and argument types. you might need to add explicit type casts Please Explain clearly Thanks in advance. أكثر...

I am building an outdoor map of Europe. Everything looks pretty nice when zoomed in. But when I am zoomed out, my map looks pretty boring. Most parts are white.In low zoom levels I display polygons only at a certain size. So there aren't many polygons that I could f.e. render as a green forest...

We are currently using ArcGIS Desktop 10.3 and ArcGIS Online. We have tables being fed from the same feature class and when someone edits a point's attributes in ArcGIS Online the last edit date/time is 5 hours ahead of the actual time (CST) This is the same problem as described in ArcGIS...

In this webinar, we’ll take a look at the ENVI LiDAR user interface to become familiar with out-of-the box functionality. We will also review custom extensions for ENVI LiDAR, developed in IDL. A big advantage of ENVI LiDAR is its extensibility with IDL, opening a world of potential for custom...

We’re continuing to move fast with the new Mapbox Mobile and are proud to announce polyline and polygon support. Now your apps can plot directions, regions, user traces, and all sorts of other on-the-fly data right atop our beautiful basemaps, and alongside the existing point and marker...

What I have: A shapefile with multiple lines. Example: line 1: A -> B -> C with attributeX=5 line 2: A -> B -> D with attributeX=7 What I want Lines between each nodes with added attributes. Example: A -> B with attributeX=12 B -> C with attributeX=5 B -> D with attributeX=7 (QGIS...

my question concerns the use and performance of several software tools in conjunction, namely PostgreSQL, PostGIS, QGIS, and GDAL. I'm a long-time ArcGIS, Python, and R user who is interested in diversifying into the free open source GIS ecosystem and Linux as well. Recently I've been very...