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

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18 views

DEM to RGB-GeoTIFF (land-/waterarea colored separate)

I want to create a colored basemap out of a ETOPO dataset. Is there a way to color the land (masked by a landpolygon) and water area separate and combine them later. The result should be one GeoTIFF ...
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9 views

r.sim.water causes crash when run on GRASS 7

I'm trying to run r.sim.water on GRASS 7.0.3 (Windows), but the module crashes directly after starting, with no error message. I only get the message that python.exe doesn't work anymore and have to ...
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2answers
1k views

GDAL/proj4 equirectangular projection coordinate system units assumed by OGRSpatialReference and GDALDataset::GetGeoTransform()?

How do I configure my OGRSpatialReference object to specify an equirectangular projection system http://en.wikipedia.org/wiki/Equirectangular_projection where the affine geo-transform matrix (provided ...
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0answers
19 views

ArcGIS, Combine tool. Crashes once reaching 40% progress

I'm trying to combine 7 rasters containing soil related data. Rasters are 4.5G, give or take. All the rasters contain integer values. Once the combine tool reaches 40% progress, it stalls and arcmap ...
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0answers
11 views

Reprojecting and Aggregating a 30m resolution raster to a 3 arcsec raster

I am a using a 30m x 30m resolution land use raster that is projected in NAD83 Québec Lambert but would like to convert it to make it compatible with a 3 arcsecond flow accumulation raster that is ...
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1answer
2k views

How to reclass a raster with reclassify grid values in QGIS?

I'm new in QGIS and I'm trying to reclass a raster with reclassify grid values. I want to reclassify by table, however fixed table has only 3 rows and I need some more, but button to add is not ...
14
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2answers
4k views

How to count and rasterize polygon overlaps in ArcGIS Desktop?

How do you take a vector layer with overlapping polygons and turn it into a raster where each cell counts the number of polygons containing that cell? We are looking at polygons of fire burn areas ...
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2answers
192 views

Pictures with no background or transparent in ArcGIS layout

I would like to add a .jpg, .png or .tiff with a no background. In other words, I want the logo to appear as it was created, without a border or background, to my Layout view. Also is it possible ...
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1answer
122 views

PostGIS convert point->raster->GeoJSON

My question is a follow up to Convert a raster to GeoJSON polygons in PostGIS. I'm trying to accomplish querying point data from the database, and then turn that into a raster for calculating ...
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0answers
32 views

How to integrate set of neighboring pixels in raster dataset?

I generated peaks of tree crowns as an individual pixels from DSM dataset, but there are some trees that have more than 1 peaks. I would like to integrate them based on the threshold value, for ...
2
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1answer
794 views

How to fill holes/missing values in XYZ data / a DEM with QGIS?

I have equidistant XYZ point (text) data that I used to create a point grid. However, it's not perfect - there are some holes. I then created a DSM raster from it, which obviously has the holes too. ...
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1answer
29 views

Failed DEM via Natural Neighbor in QGIS 2.14.2-Essen

Following the indications of Monde Geospatial (https://www.youtube.com/watch?v=bLbY3iMBW-A) I created a CSV file with the altitudinal data (Google Earth) for 2182 total points and imported it into ...
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2answers
38 views

Why does Clip function (maintain clipping extent) not clip according to polygon feature?

In arcGIS 10, I have several raster maps, that I would like to clip according to a polygon feature (top map). I have tried the Clip function under Raster Processing<-Raster<-Data Management ...
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1answer
373 views

Combine overlapping rasters in gdal_calc.py, taking the maximum value from each pixel?

I want to combine 3 overlapping rasters to create 1 raster. Each have the same dimensions, resolution and CRS. I want to populate the new raster with the maximum value from each of the layers. ...
2
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1answer
238 views

What am I not getting about JPEG 2000 coordinate systems?

I hate to ask this here because I suspect it is a very basic question, but after several days of scouring the web, I need some help with understanding JPEG 2000 imagery and coordinate systems. What ...
2
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1answer
156 views

Clipping raster-image increases file size

Working with QGIS 2.4.0 Chugiak I have a question regarding the clipping of raster images. I have an aerial picture that I want to clip using the extents of a shape file. So far so good, I used the ...
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1answer
41 views

smoothing raster layer stack using R

I'm trying to do smoothing for .tif stack layer of 331 bands. I used this code in R : setwd("D:\\") raster_dir <- "D:\\Modis VI quality\\" VI <- ...
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2answers
449 views

How to set the cell size of a tiff to 1 meter when working in a Geographic Coordinate System?

I am working in a Geographic coordinate system in ArcGIS, and I need to create TIFFs by exporting rasters. THese .TIF file must have a resolution (cell size, or GSD) of 1 m. Is it possible to set any ...
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2answers
569 views

problem to open a netCDF and create a raster file

I want to open a netCDF file and create a raster with ArcMap 10.2. The file contains the mean monthly temperature for Switzerland. I found it in meteoswiss web site. I tried to open it with the ...
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1answer
108 views

QGIS python script loop for raster calculator

How can I write a QGIS script for making a loop of raster calculator through a set of rasters? I know I can read multiple raster by applying: lddLrs = qgis.utils.iface.legendInterface().layers() for ...
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1answer
131 views

Warning: implicit list embedding of S4 objects is deprecated

From this code: na_cells <- as.data.frame(extract(r_temp, poly_contour, cellnumbers = TRUE)) Why do I get this warning? Warning in `[<-`(`*tmp*`, cnt, value = p@polygons[[i]]@Polygons[[j]]) ...
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1answer
176 views

QGis export part of map (box with coordinates) as raster

I would like to export a map of Switzerland (as part of googlemaps) to use as a background for a graph, but I need to know exactly where each corner of the map corresponds to (wrt spatial ...
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0answers
48 views

How to show a 2.5D surface of raster above terrain layer in Cesium?

I'm developing an web application that will show surfaces of rasters and terrain. These rasters are on GeoTiff format. I learned from example cesium can show image overlays earth surface. The ...
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1answer
21 views

filter a raster stack in Arcgis

i'm trying to run "Filter" operation using AcGIS on a stack layer of 331 bands. However, the result is always a raster of only one band. How can i get operation to be done on the whole stack?
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1answer
45 views

Storing Lat Long Ranges in Tables

Has anyone tried to store nation-wide lat/long ranges as a look-up table? For example: If you had a polygon dataset that covered the entire US (for example, county polygons). And you wanted to look ...
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1answer
26 views

Arcmap - raster positioning on the map

I work in Arcmap 10.3.1. I have raster dataset - spatial reference 3413 My problem is that I can not send this data on a map. Sequence: Add raster dataset Add basemap How do I display the ...
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1answer
191 views

How to get projection data (.prj) of raster image using GDAL/OGR?

I start with a boundary shape-file (think U.S. states) in lat/long that I convert to some projection, and then rasterize the result as a .tif. What I need now are the raster coordinates of the ...
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1answer
40 views

Create repeating pattern of raster or polygons in ArcGIS

I want to create a repeating pattern of raster OR polygon features based on an existing sample, so that the sample fills up a larger area in a repeating pattern. For example, with a sample of 10x10 ...
2
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1answer
992 views

ArcMap 10.1 - Tabulate Area tool “doubling up” for Overlapping Buffer Zones

This question is related to a previous question I asked: Raster Version of Spatial Join (one to many) I used the Tabulate Area tool to crosstabulate values between an overlapping "buffrast" raster ...
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1answer
49 views

How to select lines affected by sea level rise?

I'm doing a part for my master's thesis where I'm trying to find out which sites located near the coasts of Sweden that will be affected by sea level rise. I got a DEM with height data and have to ...
2
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1answer
46 views

Aerial picture - how can I extract water drainages on a crop (to vectorize them)

I have a RGB aerial picture of an agricultural crop. The drainages (hundreds of them) can be barely seen because they a very slightly greener then the surrounding crop area (picture is from April). ...
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2answers
23 views

extract pixels of raster1 that overlap with raster2 in ArcGIS for Desktop?

I have 2 partly overlapping raster datasets, would like to extract pixels of one dataset that overlap with another dataset. Is there a tool in ArcGIS for Desktop to do this?
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1answer
100 views

Why does the difference between two overlapping rasters exist?

I have two similar rasters of the Mount Vesuvius: one spans 20 kilometers, and the other one 50 kilometers. Both rasters are in WGS84 geographic coordinate system, and they overlap between each other: ...
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0answers
40 views

ArcGIS Javascript Legend widget does not show full color ramp

Has anyone used the legend widget with raster map services? I have created a GP service that returns raster maps, but the legend is incomplete. The ArcGIS layer properties are shown here, and below ...
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1answer
16 views

Swapped axes in R raster brick plot from netcdf

I am using the R raster package to import a tiny sample netcdf file, available here: https://www.dropbox.com/s/fht4g52p948vxva/persiann.ncml.nc?dl=0. The main data website is: ...
6
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2answers
172 views

Transforming geostationary satellite image to lon/lat

The ICARE Data and Services Center distributes the SEV_AERUS-AEROSOL-D3 product in HDF5 format (http://www.icare.univ-lille1.fr/archive/?dir=GEO/MSG+0000/SEV_AERUS-AEROSOL-D3.v1.03/). The main ...
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1answer
23 views

Remove raster pixel in R

This is the 32 year trend NDVI (raster data) I would like to remove the green grids data by using R (the green pixel value is larger than 0.03) and this one is R code that i use but i cannot ...
2
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1answer
48 views

Why is my attributes table greyed out for raster layers?

I am trying to view attribute data for a SRTM geotiff but for some reason I cant view the data.
5
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1answer
3k views

Accessing raster attribute table in QGIS?

I have some Python code that makes Raster Attribute Tables for GeoTiffs using GDAL. In ArcGIS I can see these attribute tables fine and they behave how I like (as classifications) but in QGIS the ...
2
votes
1answer
430 views

How to calculate zonal statistics from multi-band raster for each polygon using python?

I want to calculate the zonal statastics from multi band raster for a polygon layer. When I am using this snippet of code: vectorlayer=qgis.utils.iface.mapCanvas().layer(0) rasterfile = ...
4
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1answer
34 views

Reclass to decimals

I have a integer raster with values 1 - 10, I would like to reclass each value to a decimal e.g 0.003, 0.44 etc. This obviously doesnt work in the Reclass tool, as only whole numbers are allowed. Does ...
3
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1answer
39 views

Using raster calculator to show multiples of particular value?

How do I use raster calculator so that the new raster only shows multiples of 128? I'm not sure what the expression should be.
4
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4answers
718 views

Converting NoData to 0 values in ArcGIS Desktop?

I have a raster of landcover that I have reclassed and the different land cover classifications are now represented by numbers which correspond to fertilizer inputs. Using ArcGis 10.3, I am trying ...
4
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0answers
68 views

Convert raster to smooth contour polygons in QGIS

I have had limited success creating smooth contour polygons from a raster layers. I have created contour lines and boundary polylines and then used QGIS Union. Then I use QGIS Polygonize. Then ...
3
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1answer
107 views

QGIS GRASS raster to GeoTiff

First of all: Windows 8.1 QGIS 2.8.2 Wien I used the GRASS module r.watershed to delineate watersheds and get flows with a DEM. It worked fine so everything is OK so far. But now what I want to do ...
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2answers
30 views

Raster to KML convesrion [duplicate]

How raster data can be converted to KML? I have searched but could not find any answer. Are there any tools in Arc toolbox for such process ?
2
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1answer
188 views

Intersect shapefile with raster, then determine proportion of each raster value?

Using the arcpy module in Python, I want to find the proportion of each pixel value within the boundary of an overlaying polygon. (The polygon is in a shapefile.) For example, there are 10 possible ...
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1answer
22 views

Error in rasterToPolygon trying to get several coverage layers

I have a very strange problem: I am trying to get a raster with coverage from 0 to 1 in each cell for types of vegetation, I started with a raster of vegetation type, but I needed a raster with 12 ...
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0answers
12 views

How to query raster in PostGIS within GeoJSON mask only

I have a raster in PostGIS which I need to query pixel values from, but only within a specific area. So I have a GeoJSON polygon within which I want to extract min/max/avg values of the raster from. ...
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1answer
29 views

How to set the outline color of raster cell (pixel)?

Can somebody please show me how to set the outline color of a raster cell (pixel)? This is what I have right now: This is what I am trying to do: I googled a bit, and looks like it is somewhere ...