A coordinate-based data model that represents geographic features as points, lines, and polygons.

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Vector/Raster Intersection - Speedup and replacement for ST_Centroid

I have some raster data which is the altitude above sea level and also some vector data which represents building outlines. What I want to do is grab some buildings outlines and fetch all the raster ...
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334 views

Issues when importing line shapefiles into NetworkX

Note that although I am using Python Console from within QGIS for this, I don't think it's a QGIS issue. Below is the difference of how NetworkX is dealing with 2 line layers created by the same ...
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22 views

Drillhole Plan Trace in Arc [duplicate]

I'm struggling to find the math to do what I want. I want to plot a top down view of a drillhole in ArcMAP 10.0. I have the beginning UTM coordinate and then for every place in the hole that was ...
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66 views

How to simplify vector lines into an overlaid grid in QGIS?

I'm a relatively new user with GIS software (primarily QGIS) and I'm sure this is probably quite simple but I've been trying to find an answer for ages! I have transportation network data for an area ...
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1answer
81 views

Give Properties to a shapefile to be used by another person [duplicate]

I have bedrock geoology data. I want to classify the data so it appears with the same propeerties as it does on the suppliers website. Is there a way i can attribute a property to a layer (in this ...
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85 views

What vector file type yields the greatest detail with the Heat Map plugin?

I'm using .shp files built from .csv files and having quirky results. Perhaps there is a better way to begin. The heat map appears to be accurately describing the data but calculates a huge area in ...
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257 views

Display a single country with OpenLayers

Can I display a single country using Openlayers? I'm not trying to restrict zoom levels or . I want only one single country to be displayed. The rest of the world cannot be displayed. My reasearch ...
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31 views

Polygonize Raster to Vector Error [duplicate]

I have a problem when I am trying to Polygonize (Raster To Vector). I have a Corine map with 44 different land uses. I run a query and I save the selected areas with Bands 0 and 1. Now I am trying to ...
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1answer
443 views

Vector layer shifted on OSM map: why?

I've defined the following map: Proj4js.defs["EPSG:31258"] = "+proj=tmerc +lat_0=0 +lon_0=13.33333333333333 +k=1 +x_0=450000 +y_0=-5000000 +ellps=bessel ...
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471 views

Power line and/or power station vector (shapefile) data in Turkey

Looking for transmission power line / power station vector (shapefile) data in the country of Turkey. KML/KMZ files would also work. Found great vector data here yesterday for roads, rivers, etc: ...
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1answer
42 views

Merging SHP lines with attribute data combined?

I have one shapefile which contains hiking routes and another shapefile which has ski routes. Sometimes they follow the exact same path. In QGIS if the lines mentioned above are in the same SHP I ...
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1answer
1k views

Retrive data from database in openlayer GIS

i am using this code but it shows nothing, whats wrong with this code. <!DOCTYPE html> <html lang='en'> <?php $conn_string = "host=localhost dbname=postgis_21 user=postgres ...
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2answers
129 views

Counting raster points within boundaries in another layer?

I know this question is similar to some out there, but I have tried all the 'solutions' and none of them are working for me. I am using the latest version of Qgis. I have a raster layer with ...
-2
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1answer
63 views

Why don't shapefiles online contain the coastline (country borders)?

I have searched everywhere and Geofabric has the best packages of shps yet doesn't have the coastline of countries. I'm talking about the line that demarcates a country i suppose they are called ...
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3answers
1k views

Delivering map tiles in real-time without caching? [closed]

Is it possible to deliver map tiles quickly over the web without worrying about caching or seeding them? With raster map engines this is a problem because endering raster tiles is resource consuming. ...