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I have a set of offices, with the number of workers in each office. I need to find the mean centre of these offices weighted by the number of staff. E.g. the 'centre of gravity for staff.' I have done this by using Mean Centre tool however I need it to be carried out on a road network. I'd be...

How do I tell whether an OL3 feature is a point, line, or polygon? I need to highlight features on mouseover, and the style required is different for points, so I need to be able to tell which geometry type a feature is, so that I can apply the correct style. أكثر...

EJSCREEN is a sobering look at environmental justice. The US Environmental Protection Agency (EPA) recently released this tool using the ArcGIS Online platform. EJSCREEN lets users compare some demographic and environmental characteristics with nationally standardized data. This means...

As the old saying goes, an ounce of prevention is worth a pound of cure. It’s easier to prevent something bad from happening than to fix it after it’s already happened. For me this means stopping pollution before it starts, which is the core concept behind pollution prevention (P2) or...

On my Trimble Nomad, I have ArcPad 8 and windows mobile 8. The handheld has been working great up until recently. The machine has been very choppy and slow and when I go to add a point or really do anything I receive the window mobile gwes.exe error. ESRI help hasn't been able to find a...

I would need to load and "lock" two layers on the map. Locked means that layers cannot be removed from the layer registry. When I say removed I mean removed by the user using the QGIS interface (the remove button). And possibly make them as read only? Only if this would not interfere with the...

this my first question in this forum and I don't have much experience on QGIS I have a layer with lines representing streets in the city and I have to show the distances of intersection points of that line/street from the beginning of it How can I do this? أكثر...

I need to use the fileGDB driver in gdal, however I can't figure out how to install the driver. This is the only kind of documentation I found but it doesn't make any sense to me:http://www.trac.osgeo.org/gdal/wiki/FileGDB Could somebody explain to me how to get this driver to work? My OS is...

I am displaying three different layers on a map, essentially three separate habitat types. Each have their own colour. In cases, 2 or 3 of the layers overlap in part (essentially showing where habitat types overlap). How can I display this overlap in the legend? أكثر...

A tutorial taken from section 10 (Feature Analysis) of our Mastering ArcGIS 10 training course. This tutorial concentrates on the Union tool from ArcGIS. The full Mastering ArcGIS 10 course has 11 sections, with 25 downloadable exercises with data for hands-on experience of using ArcGIS. أكثر...

This only appears to be an issue with Personal Geodatabases (MS Access back end)... I need to search within an existing selection set to populate an iCursor. My main objective is to test whether my iQueryFilter retrieves more that one record but there is no count property over the...

There was a time where I was confused about ArcGIS Online. I was primarily a desktop user, an ArcMap warrior. I think I was still honing my Flex chops when ArcGIS Online was introduced. It started as an interesting concept, being able to share data online, having some basic map making features...

I missed Seoul, but I spotted these familiar looking family faces in Jody Garnett's picture deck. Hiroaki Sengoku and Vick Vergara: pgRouting Vicky Vergara and Vincent Picavet: pgRouting and SFCGAL Olivier Courtin: PostGIS and SFCGAL Daniel Kastl: pgRoutingAnd last but not least - the Lone...

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Maybe it's a stupid question, but I don't know how to connect layer style with database in QGIS. When I save the style to postgres database in QGIS, it automatically saves the style in the table layer_styles in public scheme. But when I want to reconnect it to the layer, it shows only...

There is no transit map more iconic than the London Underground's Tube map. First designed by Harry Beck in the 1930s, the design has inspired countless other transit network maps that are schematic diagrams rather than geographically accurate maps. But Transport for London, which operates the...

I modified a script which reclassifies a raster. It is based on the script by Roger in his blog (the second script) and it works pretty well.The problem I am facing is as follows: I would like to reclassify a value (in this case 100) to -9999 and then set -9999 as the nodata value. Below is the...

I need to generate two maps on one, I'm aiming to have a large map covering a large area in Europe and in the top right corner place another map zoomed in to a specific country. Does anyone know the method to do this, seen it mentioned but havent been able to find a tutorial. Cheers...

I am trying to adapt the openlayers code on using cql on the US states layer [topp:states] (http://dev.openlayers.org/examples/cql-format.html). I am able to change the wfs layer from the http://demo.boundlessgeo.com/geoserver/ version to the local http://localhost:8080/geoserver/ but the...

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