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I’m getting my head around all the different terms and concepts related to GIS in the UK. Next, there’s a summary of what I understand (mostly based on https://www.ordnancesurvey.co.uk/docs/support/guide-coordinate-systems-great-britain.pdf) I would like to know if this is correct. I’ll delete...

I tried to search for an answer but couldn't find any so I decided to ask. I would like to ask which would be the best way to get the shortest (and the only one) route between two points from a part of multiple LineStrings? I have road on the map and it consist of multiple LineStrings. I have...

I have some made-up data describing "Brenner" (a made-up brand) beer sales per bar, restaurant, supermarket (i.e. "Account"). The volume of beer is measured in cases. And, the time range is 4 weeks. I'm trying to create an animation, using the Timeslider tool in ArcMap 10.3, showing how the...

I want to know how to get the QGIS Console to print out actual values pertaining to a Layer's attribute table (e.g. field names, feature values, etc.). So far using the "print" command all I'm able to get are object references. The next 2 examples involve a shapefile of mine called...

I'm trying to write a query in SQL Server using 1 set of points and 2 sets of polygons. The polygons overlap, and I only want to select the points that fall inside of 1 polygon but not the other. I want to duplicate this behavior in ArcGIS for Desktop. In ArcGIS: 1) New Selection by Location...

I want to extrude a polygon shape in postgis to create a pseudo 3D effect. To this end I have written a crude function to achieve it. This is very much test code and it creates a new Y vertice for each point on the polygon and then closes it by returning to the original point:- CREATE OR...

I have an Openlayers 3 application. When using a box to select features from Geoserver WFS layer (request=GetFeature) I get inaccurate results see image below. The layer is served from a PostGIS DB. However I have the same data in a shape file served via the same Geoserver and when I change to...

What methods are available in ArcGIS 10.2 to randomly subset a selection of points. For example, in the attached screenshot I am interested in keeping 20% of the selected points and deleting the rest. أكثر...

By Judith A. Enck Staff from the EPA and the New York State Department of Health worked with the public through a SoilSHOP to address lead in soil. October is Children’s Health Month, but we should prioritize our children’s health every month of the year. As a mom, my son’s health isn’t...

Summary: Researchers from the U.S. Geological Survey and key academic partners have quantified how rapidly ancient permafrost decomposes upon thawing and how much carbon dioxide is produced in the process.&nbsp Contact Information: Jon Campbell ( Phone...

QGIS is under steady development and with the new release QGIS 2.12 we get some interesting and also visible changes in QGIS. What are the best improvements? Check them out here and decide whether to update or not.First of all: Be aware! Despite the long list of new features, this QGIS version...

Remnants of Hurricane Patricia dropped heavy rains in Texas and Louisiana. أكثر...

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I'm trying to calculate a new field from existing fields based on a simple expression for a set of polygons in GDAL/OGR. The expression is basically: new field = (field 1 / field 2) * field 3 After calculating, I need to append the new field on to the existing set of polygons and sum all the...

I am trying to use the fantastic Animaps. Unfortunately, as stated on its forum, the KML, GPX and TCX upload functions do not work. Does anyone have any familiarity with this site, this problem, or know the developer? I emailed them but the forum hasn't received an admin post in over 4 years so...

any ideas what's going on here? The lat/longs in this map have been manually picked up from Google Maps and loaded into the data table. I understand that CartDB and Google Maps both use WGS84 so this should "just work", right? It looks like there's some kind of standard offset to the...

Why is "calculate geometry" grayed out when data frame properties shows map units are I'm using ArcMap 10.0 and am trying to get the length of a polyline by adding a field to the attributes table and calculating geometry, but that option is grayed out. Someone suggested that it's because my map...

Viewing slope in Google Earth through an oblique perspective, through use of the path profile tool, and by calculation of percent slope أكثر...

Is it possible to open Sentinel-1 products using ENVI 5.3? GeoTiff Sentinel-1 images can be opened independently but I can't open the product (from its xml file) using ENVI. I mean, is SARscape necessary to open Sentinel-1 products? or is ENVI enough for that. I guess that for the...

This is maybe rather subjective as it concerns style, but I would like to have a few decent colour ramps for my DEM when it is layed over my hill-shading. I have created the Swiss hillshade model as shown here, but I'm not too convinced that the colour scheme is good. Any examples or...