Raster is a data format consisting of regular grids of values, usually stored in an image-like format.

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QGIS 2.14 open raster crash [closed]

I am using QGIS 2.14 on Mac OS X 10.11.3; every time I try to open a raster file, in any format, QGIS crash, any suggestions?
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Correlating raster layers

I am trying to correlate contaminant data with other variables. For instance I want to see if high values of contamination coincide with topographic lows in my elevation raster (DEM). All the layers ...
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49 views

How to insert raster in PostGIS from java JDBC

I have been looking for a solution to store dynamically generated raster data into PostGIS from java and PostGIS JDBC. I am working with geotools toolkit but i am unable to find any documentation ...
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26 views

Create MosaicDataset with 12 Bits

I'm using ArcGIS 10.3.1, and I want to create a mosaic dataset, but my rasters are in 12 bits, and a mosaic doesn't have this option. What can I do?
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31 views

Combining overlapping polygons to make a raster

I'm working in Arcmap10.3. I have some polygons layers that over lap that I want to merge to one polygon layer. Then I want to convert it to a raster in the end. I want the top layer of the 4 input ...
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107 views

Identifying value of closest non-NA pixel

I have a raster representing a large landscape, where pixel values indicate particular land classes. I have been using the "distance" function in Package 'raster' in R to calculate the distance from ...
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36 views

Is there an 'average' algorithm for st_resample()?

Currently, the docs for ST_Resample() give options for NearestNeighbor (English or American spelling), Bilinear, Cubic, CubicSpline or Lanczos resampling algorithm. ref: ...
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Is it possible to use a raster::click event within an interactive leaflet map?

Data Download: https://www.dropbox.com/s/f849ra8l6umo9d8/crops.tif?dl=0 I have various raster images of the world that I would ultimately like to plot within an interactive leaflet map; an example is ...
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19 views

Merging Raster Images Changes Its Coordinates

I'm trying to merge raster files (Landsat images) for the island of Sumatra, Indonesia. When I upload each raster file to check if I have all of the island covered, I get this: However, when I use ...
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55 views

How to avoid unexpected values in border of slope raster in QGIS

I have a DEM like After calculating slope with QGIS, it's showing the following result So, how can I remove the unexpected value at the edge of this DEM? Which is showing almost 90 degree ...
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27 views

Contour Extraction from Scanned Raster Image in Qgis

I have a scanned raster image containing contours and rivers. I am trying to use qgis to extract these contour and river polylines for analysis. As a start I was thinking of the following process ...
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What to do with polygons that were created from a raster file? [closed]

I need some suggestions. I'm working in Arcmap 10.3. I used a NDVI landsat product to find patches of row crops. I then extracted these cells and turned them into shapefiles. I want to measure the ...
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42 views

QGIS Has Rendering Error on JP2000 Raster. Works in ArcGIS

I've got a large .jp2 raster file that was created using 'Mosaic to New Raster' in ArcGIS. I'm trying to open it in QGIS 2.8.6 (I've tried 2.8.14 as well) and am getting a vertical line that won't ...
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36 views

Convert from unsigned (8 bit) integer to short integer grid

I'm looking to convert a unsigned integer grid to a short integer grid for use in TauDEM. The unsigned integer grid has values ranging from 0 - 4.
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Clipping raster with Postgis raster

I'm using Postgis 2.1.5 on Ubuntu 15.04. In my system there is a second disk mounted with the raster data as /media/name1/data/rasters/*.tif. The *.tif are good looking when I watch the metadata with ...
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53 views

Georeferencing Raster automatically fails

While trying to auto register a raster image in georeferencing - using a wms raster layer as reference - I get the simple error message "Failed to auto register". Thereby the Link Table remains empty. ...
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26 views

Do rasters have to be of same extent for the QGIS Raster Calculator?

I am trying to use the Raster Calculator but, I get a raster with Nan values. My rasters are in the same projection system but, one of them, it is a classified landsat map which covers only some part ...
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39 views

PostGIS raster - sum of rasters

I have raster data stored in a PostgreSQL/PostGIS database. I need to create a summed raster from certain rasters. Something like: select sum(raw_data) as image from data where rid > 2 AND rid ...
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20 views

Images raster Mozambique

I'm looking for a high resolution raster image for the province of Maputo in Mozambique. I need it to get the elevation and topography for the area of Moamba-RessanoGarcía. Anyone knows any website ...
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R use data in SpatialGrid to create SpatialPoints

I am trying to make a grid of points to overlay on a raster of vegetation of Kansas, U.S.A. My idea is to use the points as a sort of centroid for the raster pixels, which are 30m resolution. When I ...
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50 views

PostGIS raster geoTiff simple Lat/Lon query example

I've successfully loaded a geoTif into PostGIS (Postgresql 9.3.9) using the following command on my Ubuntu 14.04 server:- sudo -u postgres raster2pgsql -s 4326 -d -I -C -M -R -l 4 ...
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116 views

Interpolate temperature data (shapefile) using R

The answer below solved my fist question, so I edit my question as follows: I have a shapefile given with the attributes lat, lon, elevation and temperature. So far I have a script that interpolates ...
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51 views

Is there an analog of PhotoShop's “Magic Wand Tool” in ArcGIS Desktop?

I want to interactively select rasters pixels based on it's values and modify them. Here is example of what this "Magic Wand Tool" should do:
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Extracting one band from multiple stacking raster layers using PyQGIS? [closed]

I've got 1000 (one thousand) RapidEye raster images. The stacking layers has bands 1, 2, 3 and 4. I need to extract the bands 1, 2 and 3, then save the new file discarding the band 4. I've tried to ...
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36 views

How to make a single raster which shows the year since the last fire

I am using ArcGIS 10.2.2 to make a single raster which shows the year since the last fire in an area based on the MODIS Maryland University raster layers. I have 15 raster layers all from a different ...
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Snapping a point into a raster grid

Currently I have a raster grid in the SDE. This raster grid represent certain region (For example: Raster grid for one island). On the other hand, I have point features which are plotted within the ...
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47 views

Identify the top 10% of raster cells

I have a raster with different risk values for a hazard. How can I identify the top x% (eg. 10%) of the raster cells with the highest values within ArcGIS?
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51 views

Rotating ~90° using Two-Point Equidistant projection with Proj4

I'm trying to rotate a tif raster in R using Proj4's Two-Point Equidistant projection - I think the only way to rotate spatial geometries to custom angles. But I'm finding the operation gets very ...
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30 views

How to add hypothetical values to a raster?

I have to create Non-Regulatory Products for a few FEMA regions. Right now I am working on the 'Increased Flooding Scenarios' where you add a hypothetical value to the existing Base Flood (1', 2', and ...
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26 views

where are the rasters that make up a layer?

I used raster calculator to add up 12 rasters made up of 0's and 1's to make a fire frequency map. Then I saved the output as a layer (lyr). However, I need the raster output. Did I add it up ...
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Create a new GRASS database in R with CRS projection

How to create a new GRASS database in R with CRS projection? I am able to create a new one using the following code but it is not projected require(raster) require(spgrass6) ...
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39 views

Converting an ENVI raster as point shapefile for editing in ArcGIS?

I have an ENVI raster with multiple classes inside. I tried to export this to a vector so that I can convert it to a shapefile in ArcGis (I want to manually edit/delete points in the raster), but the ...
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68 views

Clipping a raster with a shape layer fails by returning an empty raster (nan - 0)

I am trying to clip a raster layer by a shape define by a polygon. (A previous question was about a line layer clipping, whereas this one relates to raster layer) The resulting layer is however an ...
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How to clip raster to 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 have a specific surfacic information for my polygons (avarage slope value). The ...
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Raster Imagery Performance

I'm currently building a project that will involve using raster imagery in the field on a Windows tablet with QGIS/Intramaps Roam and haven't been able to get a satisfactory understanding of a few ...
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How to reclassify multiple rasters into 3 categories

I have 120 rasters that I need to reclassify into two categories. All values which are 0 need to be 0, all values between 1-366 need to be 1 and all values above 367 need to also be 0. I have ...
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Reprojecting a raster file in R

Help! I have a number of rasters from different sources with different projections. I want to reproject the rasters into a common projection (Eckert IV), somehow line the grids up, and then overlay ...
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27 views

Retrieving raster classes as data type in Python Script tool?

I want to program a python script tool in ArcGIS where the user should be enabled to input a classified raster and, based on this raster, the classes should be selectable. EDIT: As is suggested in ...
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Extract values from Rasters in R based on spatial points and spatial polygons

I am trying to extract values from a raster file using the extract command in R mentioned here: http://www.inside-r.org/packages/cran/raster/docs/extract My raster file is unprojected (WGS84 ...
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Clip multiple raster error using Semi automatic classification plugin (SCP)

So I have to clip 25 raster layers of NDVI using a shapefile and the SCP plugin. This error keep showing error has occured while executing Python code: Traceback (most recent call last): ...
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Raster and digitized shapefile misplaced in same projection

I have georeferenced .tiff rasters with cadastral borders and corresponding digitized borders in shapefile based on that raster. All that was done in some Mapsoft software. When I insert both in QGIS ...
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Refining a Viewshed

I have been tasked with finding the observable area of a canoe route based on a drainage, stream and contour file. First, I made the drainage a line file and then merged it with the stream. I then ...
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whats wrong with my exported raster reclassify map in grass?

I'm trying to export a reclassify map in grass to a Geotiff format to pass it to DinamicaEgo platform. I have 6 classes in grass but when I export it, the exported map show me 255 classes and they ...
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17 views

Create Point Layer from Raster [duplicate]

How would I create an evenly spread Point layer (Qgis), where each Point is located in the middle of a raster cell from a given raster layer?
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21 views

Vector to raster conversion: Gaps within the vector boundary

Is there a tool in ArcGIS that will make the output raster completely encompass the vector boundary? Somewhat similar to select by attributes where all overlapping features however minuscule is added ...
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How to change Raster symbol values (Unique Values) in ArcObjects

I want to change Raster properties symbology using with Arcobjects. Unique Values change as per below attached snapshot. Dim pWSFact As IWorkspaceFactory Set pWSFact = New RasterWorkspaceFactory ...
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Georeferenced image not displaying

I used Georeferencer to georeference a jpg map and saved as tif. I used Thin Plate Spline, Cubic Spline, and LZW as settings. The tif shows fine in OSX Preview. gdalinfo reports Driver: GTiff/GeoTIFF ...
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Displaying numbers of single band raster layer in QGIS without additional vector layer?

I wonder if there is a raster symbolizer in QGIS with a label option, that renders the cell values as labels of single band raster layer, a scalar field. The standard raster symbolizer dialog in ...
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Problem with ST_Union

I have loaded some rasters into Postgis. I did a lot of ST_XXXX (scale, snap to grid,resample) magic to make them aligned. After executing: select r1.rid,r2.rid ...
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How does GeoServer/RasterSymbolizer ramp interpolate?

I want to encode data using a colormap using GeoServer/RasterSymbolizer, by mapping data using the full 24 bits in RGB. I am thinking of the following scheme: <ColorMap type="ramp"> ...