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

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How to reassign Raster values to new values in QGIS?

For example, if the Raster has integer values ranging from -1 to 3 and the value that I am only interested in is 3, I then want to assign values -1 to 2 to 0 and then have the 3 value set to the value ...
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44 views

NumPy to GeoTiff for use with Gdal

I have a few NumPy arrays: lat, lon, and 6 data bands. I'd like to convert these to GeoTiff and then apply the gdalwarp function, based on a specific projection, to each band. Is there a standard way ...
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190 views

add multiple rasters, each located a branch too deep in separate folders - ArcGIS

I have a year of daily raster datasets (365) that I would like to use the Cell Statistics tool on; however, each raster is located in a separate folder so I cannot add all of them at once. ie: -...
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2answers
130 views

How to update raster pixel values based on another raster with conditions in QGIS?

I have 2 land cover rasters. I want to update parts of the first raster with values from the second using QGIS. The workflow should be like this: 1. Select values equal to 30 and 34 in the first ...
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2answers
34 views

How to convert a raster output in a stack in R into ArcGIS

I am modelling the response of a bird (skylark) to various climatic and topographical variables in the program R. Using the predict function I predicted the abundance per pixel (see below for code). I ...
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25 views

QGIS Lost precision when converting raster to vector

I am after running ordinary kriging, converting raster to vector I lose decimal value and only get whole number. I have added first the raster then the vector image.
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24 views

Updating a raster using a shapefile [closed]

I have a huge raster file and want to increment all the values within a relatively small shapefile by 1 in Python. Speed is of critical importance, as I have to do this many times. I have been ...
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72 views

GRASS 7 Cost surface and elevation points development

I'm a new to GIS and I'm trying to develop an optimal path across an area by using GRASS 7 features. It is very similar to the task given here. The problem is that I don't have any data with ...
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32 views

Iterating over a raster layer in ArcGIS using Python

I have a raster layer for drive times. I have another raster layer with my bounding geography. I want to tell ArcGIS: For every cell in geography: if the corresponding cell in drive time is not ...
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44 views

Calculating area of polygon within square mile in ArcGIS?

I would like to create a raster, where in every cell it returns the area of land in a polygon feature. So for example, every cell in the raster would give park land per square mile, or vacant land ...
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40 views

Multiple HDF5 files in single GDAL virtual raster

Does anyone know how to generate a single GDAL virtual raster linking multiple HDF5 files to each other? Each file represents different swaths of the globe with different lat/lon coordinates and data ...
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2answers
357 views

Extracting multiple values of raster to polygons using ArcGIS for Desktop?

I was hoping I could get some help on how to extract information from a land use raster using polygons. I have a layer with 157 polygons and a land use raster with multiple land use categories for the ...
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71 views

Create a raster with ranges from another raster

I have a raster that contains values ranging from 1-180. I am looking for a way to create a new raster where if the values of a cell in the original raster is between 1-10 the new raster cell gets the ...
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5answers
288 views

List of GDAL raster file extensions

I am trying to compile a list of file extensions that are accepted by GDAL, something like ['.tif', '.png', '.jpg', '.jpeg', ...] I found a list of GDAL Raster file formats, but the values in the "...
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22 views

Arc Viewshed2 requires a vertical coordinate system

When I use the Viewshed2 tool with Arc 10.4, a 010451 error results when I try to add the input raster layer to the tool. The error states that the input raster is missing a vertical coordinate ...
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138 views

QGIS: How to change symbology of a continuous raster to discrete with unequal intervals?

I'm new in QGIS and currently trying to convert my ArcGIS-layers into QGIS. One of these layers is a slope gradient raster. I want to change the symbology so that a specific rang of gradients will ...
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2answers
43 views

TIF with TFW not opening and NO spatial reference

I will receive tif files with the associated tfw. I always thought that these would open correctly in Arc. When I check the spatial reference on the tif it states undefined. So I try to add it myself, ...
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40 views

Statistical properties of raster image

I want to calculate mean and standard deviation of a raster image. In QGIS zonal statistics, we can calculate it within a polygon or a vector. But I want to calculate for whole image. In Python I'm ...
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58 views

Raster Catalog QGIS; performance

Is there a comfortable way to generate efficient raster catalogs (such as in Arcgis), where polygon tiles are loaded as long as the scale does not hit a threshold value and images are only loaded when ...
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88 views

Raster calculator creates strange output

I am trying to combine two raster layers (one is nighttime satellite data, the other is the GPW population density data). I am using raster calculator to combine the two (the following is for a ...
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1answer
283 views

Exporting .tif from referenced mosaic dataset does not use functions in raster dataset

Very frustrating little issue in ArcGIS 10.1 -- I have a referenced mosaic dataset of terrain data that has a series of functions inserted (slope and several iterations of a statistics function to ...
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1answer
32 views

Get indices from pixels with a certain value in PyQGIS

I'm working in the Python-Console of QGIS and I have an object form the class QgsRasterLayer. I want to get the indices of those pixels that have certain pixel value (e.g. I need the indices of all ...
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200 views

Why am I losing part of my raster when I reproject?

QGIS 2.0 Working with tiff raster file. Reprojections are in WGS84 Mercator. Here is my problem: I am trying to use buffers or urban areas to analyze light intensity on a raster layer. I want 30 ...
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41 views

Correctly querying a raster mask only

I have a rasterA (whole Scandinavia, with values from 0-255) and a rasterB (in blue, a small part of south of Norway, entirely inside rasterA). I want to query the pixels of rasterA which are inside ...
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44 views

Concerning “Error when using r.series in a python script”

Based on the "Error when using r.series in a python script" discussion (Error when using r.series in a python script) and based upon the solution given by Joseph I tried to make the same but by using ...
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273 views

What exact format do I need to have for the inputs to make Path Distance work?

I am trying to run the Path Distance tool in ArcGis 10.1. Ideally I would like to utilize Tobler's hiking formula anisotropic approach to slope and a land cover cost surface to calculate the least ...
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32 views

Bands Names QGIS when merging rasters

I have downloaded landsat satellite data, then I merged the 4 bands I am interested in into one file (raster-merge). The problem is that I merged bands 2,3,4 and 8, and in the merged file the bands ...
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44 views

Counting number of raster groups within buffer layer?

I am trying to count the number of times each category of a raster layer appears in a buffer square. I have attached a picture to help explain. In the picture example I would want the 'red group' to ...
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1answer
34 views

How to interpret cell size arcgis

I have a raster layer that has cell size(x, y) 0.008928, 0.008928. I download it from the website as 1km resolution data under WGS_84. I can not find the unit for these numbers in the metadata. Is ...
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18 views

How to resolve issue with model output in degrees and ASCII format cell size in meters when converting to a raster?

I am new to using Arc. I have data from a model output where each grid cell is 1/16 of a degree resolution. I have put the data into ASCII text format, however the header for ASCII under "cell size" ...
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1answer
111 views

Converting Road Lines to a Binary Raster Image

I got road data from the USGS database and imported it into QGIS. And I want to transform it into a binary raster image that looks like this in QGIS (this is only a processed screen shot but I want ...
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1answer
23 views

Deleting rows from attribute table for large raster file using ArcGIS model builder

I'm not super familiar with raster datasets, so I may be making this too complicated. I have a large vegetation type raster that I need to convert to a shapefile. When I do raster to polygon, the file ...
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34 views

ArcGIS 10.3 suddenly not reading .tif/.tiff rasters [closed]

Anyone ever experience losing the ability to access .tif/.tiff rasters in ArcGIS/ArcCatalog? Both geotifs and general imagery tifs have become unusable, one day after I was able to access and use both....
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37 views

How to store large time series of raster images

I've got a large time-series of rasters, derived from satellite images. Each raster is about 2000 x 2000 pixels, and I've got about 10,000 individual images. I'm trying to work out what the best way ...
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35 views

Per-pixel Descriptive Statistics through multiple Raster layers

I'm looking for computing different descriptive statistics through a set of raster layers. I need to make it with a python script capable of running into a standalone tool within the QGIS. To do so ...
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25 views

DEM from Google Earth, Natural neighbour fails

Does anybody know, why using the tool Natural neighbour fails, when trying to get raster from shape? I followed the instructions here: https://www.youtube.com/watch?v=bLbY3iMBW-A, but all I get are ...
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27 views

Merge village level shapefiles by sub_district_ID to get a new shapefile using R

I am new to using R for manipulating shapefiles and need help with merging the areas inside the shapefile to a superset based on the sub_district_IDs and get a new shapefile.
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25k views

Joining several raster files using QGIS?

I'm new to QGIS. How can I combine multiple raster layers into one layer? The raster images are of different areas with very little overlap. The goal is to bring numerous town plats into one ...
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40 views

How to build a raster (population density) dependend diagram in QGIS?

I'm using QGIS and trying to solve the following problem. I got 2 layers: 1. population density raster 2. point layer with the information about number of people could be hosted/served etc in this ...
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34 views

Average raster to single value in ArcMap

I need to shift a raster a small bit. I got the distance and the direction using the path distance and cost path tools. I walked into two problems. I have a raster with distance values. I want to ...
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381 views

How to store Large Raster Images of Equipotential Surface Generation Using Monte Carlo Simulation?

I have a large (1GB+) raster that I am using as the base for the generation of an equipotential surface. This is to assess the accuracy of DEMs derived from another source. In situ observation is ...
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1answer
231 views

using raster.predict for Cubist model, factor levels list

I would like to thank in advance any help or advice. Let me know if I need to provide more reproducible data/code. I am working on a Cubist prediction model for soil texture, using continuous and ...
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25 views

Reprojecting multiple rasters in ArcGIS Desktop?

I have classified layers of Landsat 5 and 7 of several years in Geographic coordinate system WGS84. To reproject this to UTM, is there a simpler way than using Project Raster tool in ArcToolbox?
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350 views

Issues calculating range with QGIS 2.0 raster calculator

I would like to calculate a simple range using the QGIS 2.0 Raster Calculator, but am getting strange results. I believe I am not using the correct syntax. To get all values between .003-.5, I ...
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8 views

Rasterize all layer attributes with gdal.RasterizeLayer

I want to rasterize a layer and to have a 2 bands raster in output where the first band is the first feature of the layer and the second one represent the second feature. I tried that but i have an ...
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518 views

ArcGIS model builder: How to reclassify 16,000+ rasters and do weighted sums on these rasters per year?

I've been trying to build a model in model builder (ArcGIS 10.1) which can do the following task: I have a folder full of ca. 16,000 raster files (.asc) representing mean temperatures for each day ...
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30 views

How do you convert a raster of digital values of ndvi to an index of NDVI?

I have a raster of the Mean May Normalized Difference Vegetation Index (NDVI) that is a composited measure of VGT daily images, acquired between 2000 and 2009 in May, using the Mean Compositing ...
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181 views

Finding coordinates of the image corner

I have a .bmp image with a map. For creating image i used a Ingeo 4.4 and function MakeImage() What i know: Height an Width of bmp image dpi Map Scale Image Center's coordinates in meters. What i ...
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33 views

Raster to TIN error

I have a big raster file (6,5gb) that I am trying to convert it to TIN format. What happens is that after 15-25 min of processing I get this error message Can someone tell me how can I fix this?
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27 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 (...