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I want to write software that merges groups of (mainly) adjacent polygons. For example, merge the US counties into sales regions. Then, display either the boundary of these sales regions or fill them with some color indicating let's say sales numbers. Preprocessing and merging the given shapes...

I have the US census data of state boundaries, which is in the SRID 4269, in the MS SQL DB. My input data for calculations against that state boundaries is in the SRID 4326. As far as I can infer from the SpatialReference.org, the SRID 4269 is just a subset of the SRID 4326 and no coordinates...

I'm working along a road. On each side of the road I have points with different attribute values (forest height).I want to to calculate the difference between the attribute on each side of the road at specific locations. I have around 600 locations to do. How can I do that? I'm using ArcGis 10.1...

I'm experimenting around with my postgis2.0 database. I want to create a basic table to store all my point data and in the process,I realized that the coordinates are in different CRSs. So naturally I'm wondering now if the the_geom column can contain a variety of CRSs - or Im confined to a...

Samuela Naicegucegu, Director Land Use/Land Reform, Ministry of Lands and Mineral Resources, Fiji Islands, tells how maps or geospatial data is making a difference in Fiji. أكثر...

I work for a mid-sized school district and we unfortunately have to close one of our school buildings. That means that the neighborhoods who've been sending their children to the school that is closing will need to be redistributed among the remaining schools. Currently, I have several kml...

I have a shapefile with administrative divisions. How could I get the name of the administrative divisions from GPS coordinates using this shapefile (not an online API). I have installed pyshp, gdal, matplolib basemap, but can't figure it out. I have found this package...

مجموعة من العروض حول موضوع التنوع البيولوجي نقدمها لكم للتحميل والاستفادة العرض الأول العرض الثاني العرض الثالث كما يمكنكم مشاهدة باقي مواضيع الجغرافيا التطبيقية. أكثر...

Bonjour @ tous. J'ai besoin de vos lumières sur certains points que je ne maitrise pas complétement, je vous explique. Je souhaite intégrer, dans une carte WEB conçue avec OpenLayers 3 un fond de carte développé par mes soins, à la manière d' OSM ou de Google Maps. J'imagine, au vue du...

Summary: With the release of new US Topo maps for Illinois and South Dakota, the USGS has completed the second, three-year cycle of revising and updating electronic US Topo quadrangles. This means that since late 2009, the USGS has published nearly every map in the conterminous U.S., twice...

I tried to use this solution for my Image stacks, but I doesn't go through data!! I think the problem could be from the pat which use regex to extract year and month from file path. All the data are in a folder called data_sample and here is the name of the files...

I need your guidance on the problem below. I am using qgis.I am new to GIS and also qgis tool. Hence please excuse me if the terminologies were not appropriately used. There are two layers imported into the qgis project.Layer-1 (green) has attributes ID, area, codeLayer-2 (brown) has attributes...

i got my layers working with this code: L.control.layers(baseMaps,{' Test': json_TestJSON,},{collapsed:true}).addTo(map);This is what i dont like: the white empty square if not hovered. How can i add an image to this square? thanks! أكثر...

I've got an ST_Difference query runnning error free in PostGIS, and in PGAdmin I can see the output table but it's not viewable in QGIS - The table name appears in DB Manager but says "There is no entry in Geometry Columns". What do i need to do to view the results? Here's my query: DROP...

I've trying and reading how to publish a Postgres/Postgis View in Geoserver. I know that I can create an SQL View in Geoserver, but I'd like to define the View in Postgres, not in Geoserver. Does anyone has an example of how it's done? So far I've tried this, but I can't see the content of the...

I am developing an app which allows user to access maps in disconnected mode (without internet connection). This is what we did so far:Created a sync enabled feature service on ArcGIS server. The mobile client downloads geodatabase file from this feature service to use offline. For basemap I am...

I am developing an Android app using OSMDroid. I want to have map data on the device for offline use. I am using MOBAC to get the data. I selected OsmDroid ZIP for the format. In this format at least, an atlas is limited to, for example, zoom level 15. How can I get more levels? Will one of the...

The GIS Day Adventure! [View the story “#GISTribe chat #87 (2015-1119)” on Storify] أكثر...

I have a geodatabase that I am adding to a QGIS project. I read the documentation (below) but I don't understand what parameters I use for "a.the_geom" and "b.geom". Is there a way to clip with a bounding box? Or, what is the best way to reduce my huge data to just the small portion that I...

I have a polygon dataset (shapefile, mapinfo tab file) which I would like to "clean" to be topologically correct. The polygons are assigned an ID which represents a specific class. For example ID 3 is forest and ID 2 is grass. In general the polygons does not touch or overlay but there are some...