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I need to attribute a geographical area (based on shapefile polygons) to 8 million GPS points. There are 405 polygons. I currently have the code below, and a quick extrapolation tells me it will take 84 hours to compute this. I am new to GIS, but intuitively, I feel that there has to be a...

In ArcGIS FieldMapping, is there any way to add "FieldName", while we use MergeRule-Join? Please refer the attachment; I know, we can concatenate Field Values using MergeRule-Join, with Delimiter "|". but is it possible to add FieldName before FieldValue. Expecting Best Regards...

I have two tables. One has points in EPSG:4326 and the other one has polygons also in EPSG:4326. I loaded these two as layers in geoserver and show them using openlayers (as shown in image) Now I want to write a query in postgis in which I find the intersection area of each green point...

I´m using QGIS Lyon 2.12 and am trying to make a map in the print composer with the scale 1:25000 in A4 size. I have drawn the map layer, but the map only covers a small part of the A4 space in the correct scale. I´d like to resize the layer in print composer so that it covers more space, while...

لمحة تاريخية قد تمت المصادقة من طرف 195 طرفا على اتفاقية الأمم المتحدة الإطارية بشأن تغيّر المناخ منذ اعتمادها في عام 1992. واعتمد بروتوكول كيوتو في عام 1997 من أجل تطبيق الاتفاقية، ودخل حيّز النفاذ في عام 2005. وحدّد البروتوكول أهدافا تتمثل في تقليص انبعاث غازات الدفيئة والحد منها للبلدان...

I want to find out how QGIS can be used as a pre-processor for modflow, i.e delineating the model boundary and boundary conditions etc. exporting to modflow for analysis, viewing and/or mapping the results in QGIS. I am new to QGIS and GIS in general but I was told that this is possible in QGIS...

I am using tilestache to serve mapnik OSM map, I am finding it really slow when mapnik rendering is interrupted (say when user zooms out twice with empty cache). It has to wait for the first zoom requests to all disconnect via a broken pipe error like below: Exception happened during...

The shapefiles that I am processing display information on an operation of a piece of equipment over an area, where the information is stored in steps as polygon features with various attributes and values. My goal is to present the information using a colour spectrum so the colors represent the...

I found a lot of pieces of an answer to this question, but no complete and good one. How does a GPS System calculate it's own accuracy at the moment? Where does it get the known position to compare measured positions to? أكثر...

I have a line vector layer which has multiple segments within individual polygons in a separate polygon layer. I have spatially joined the attributes so that each line segment now has the same ID as its corresponding polygon. I need to calculate the lengths of the lines within each polygon...

I am new to ArcGIS and trying a do following things.. 1) Select polygon in the loaded shapefile.(right click on polygon -> choose option (select features).2) Click button (build as Add-in) in C# on the toolbar and selected polygon save as image at specific location. أكثر...

Similar to beautiful maps example is there any similar collection for 3D maps? أكثر...

What's the utility of osm_meta column in osm2po (Version: 4.6.9) generated data? أكثر...

How to convert the python plugins into dll files for QGIS application? أكثر...

Bonjour, Je travail sur un projet d'aménagement urbain. La commune m'a fourni les données SIG suivantes : - BD Parcellaire - Sections Pour pouvoir superposer le plan d'aménagement (réalisé sur AutoCAD) sur le cadastre de la commune, afin de notamment pouvoir identifier les parcelles, leurs...

Le parc naturel régional Oise Pays de France, qui couvre un territoire de 59 communes situées sur le département de l'Oise et du Val d'Oise, a mis en place un SIG depuis 2004, et un WEBSIG ouvert à l'ensemble de ses partenaires depuis 2007 ; Sous la responsabilité du chargé de mission...

I have created a PostGIS database containing shapefile data, but I will also be collecting additional, non-spatial data for each polygon. Is there a preferred method for storing this data? أكثر...

I made a Python-Addin-Button with the function to create a zip. Everything works fine, but after creating the zip-file, the zipfile is locked, when the mxd-Project is open. Any suggestions why I can't open or delete the zipfile? Here my script: import sys, os, arcpy, zipfile, traceback...

I am trying to create soil nutrient maps from an excel table. My table has the location with multiple nutrients for each location (Nitrogen, Potassium, pH etc). I would like to create a choropleth map for each nutrient, i.e: a map showing the Nitrogen levels at each location, a map showing...

I'm trying to open this xml source in Qgis:http://webgis.regione.sardegna.it/tms/ortofoto1977_EPSG3003/tilemapresource.xmlbut I see only a corrupted image. Where did I go wrong? أكثر...