Linked Questions

0
votes
1answer
900 views

QGIS: Delete information from rasters and shapes that are out of country borders [duplicate]

I am trying to make topographic maps for some countries and show only those countries. I already created reliefs from SRTM-data and imported lake and river data from Natural Earth. Now I want to ...
21
votes
2answers
44k views

Cropping raster layer using QGIS?

How do I crop a raster layer in QGIS? I want to make contours from a section of a layer, and including the whole layer will create far more data than I need and slow down the rendering. I have ...
7
votes
3answers
10k views

Clipping raster using polyline or polygon using ArcGIS Spatial Analyst?

I have a large raster created from values that cover the whole United States and Alaska which are both polygon and polyline features, this raster was caluclated using Spatial Analyst IDW Interpolation....
7
votes
1answer
2k views

Extracting donut holes as separate layer in QGIS?

Does anyone know how I can extract the holes in a polygon layer as a separate layer in QGIS? An example could be a country with a number of lakes cut out of the polygon - I need the lakes.
2
votes
3answers
9k views

How to clip a layer file

I have a world imagery layer that I want to clip to a single county. I would just save as a JPEG and edit using other software, but this uses a lot of processing power if I want a high resolution. I ...
3
votes
1answer
5k views

How do I clip/mask a satellite photo to a polygon?

Given a shapefile composed of contiguous polygons, I'd like to clip (or mask) regions of satellite photo to the polygon outlines, and export each resulting raster in medium resolution for further ...
7
votes
1answer
7k views

How to clip raster and split by individual polygons in QGIS

I have two layers. The first one is a vector layer with 6 polygons. The other one is a raster layer. I need to extract specific surface information for my polygons (average slope value). The ...
1
vote
4answers
2k views

Clipping raster with vector layer using MapInfo?

With MapInfo 12, i would like cut my raster layer .tab with one of my vector layer. How to do this basic task with MapInfo? Is it possible with mapinfo to convert .tab raster table toward any ...
3
votes
1answer
1k views

How to hide some parts of an image layer with OpenLayers?

My Problem I'm currently displaying a layer image above a Google Maps base layer. I would like, when the user check/uncheck some checkboxes, that some parts of this image layer disappear, and the ...
5
votes
1answer
609 views

QGIS - How to globe-rotate a raster around the Greenwich Meridian? [duplicate]

This is probably the easiest way to explain my problem: I'm not sure how to say what this problem is - is it that the shapefiles and the raster are using different longitudinal origins? (probably ...
2
votes
1answer
1k views

Clip raster (DEM) with vector layor in QGIS

I am trying to trim/clip a DEM with a shapefile layer. I read somewhere that the GDAL should be able to get the job done, but can't seem to get it to work. I have a raster layer and a shapefile layer,...
4
votes
1answer
404 views

Cropping raster and merge it to overlapping DEM?

I am working with an existing DEM of a river and its surrounding area in QGIS (actually a virtual raster from four separate DEM TIF tiles). My goal is to add a bridge's profile to the DEM. I have a ...
1
vote
1answer
424 views

Why does the Clipper tool lack the mask layer option?

Fairly new at QGIS, but everything's gone well so far. I'm running QGIS version 1.8 on a Mac (OSX 10.8) and GDAL 1.10, and other GDAL tools (like Merge and Georeferencer) work just fine. When I ...
0
votes
0answers
463 views

Clipping land cover grid with shapefile in QGIS

One very common application of GIS to ecology is to layer a set of vector polygons over a land cover grid (or some other land feature raster) and clip it to determine the percentage of the cover ...
4
votes
0answers
338 views

Calculate average value of a raster, that is clipped by multiple polygons? [closed]

I have a raster of coherence value (SAR interferometry) and a land use shape. I wish to calculate mean coherence value for those areas with a specific land use. I split land use shape into specific ...

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