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

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40 views

Tin created from raster have different profile graphs?

I have created a TIN file from a Raster one, but the profile graph from TIN is different from the Raster. Here I attach a image where in the left is a profile graph from the raster, and on the right ...
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42 views

ArcGIS Pro 3D rasters?

I am trying to use ArcGIS Pro to create a 3D scene using an elevation surface (.tif) generated from drone imagery. The tif is projected and contains the elevation information, but I cannot get ArcGIS ...
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55 views

extract() function from r raster package returns different cells if “weights” parameter is TRUE or FALSE

I am trying to extract cell values from a RasterLayer based on a SpatialPolygons object. I create the raster with library(raster) rasterValues <- matrix(rnorm(20),4,5) r <- ...
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41 views

How to clip MrSID Files in R and export to GeoTiff?

I would like to use R to: Read in an MrSID raster (.sid format) Clip the extent using a shapefile Save the new clipped raster as a geotiff I am fine with steps #2 and 3, but I can't find any ...
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69 views

How to use ModelBuilder to run tool extract by mask on many rasters in ArcGIS for Desktop?

I'm trying to extract the same part of multiple rasters (Landsat scenes) using a polygon so I can do a time series. I've been trying to do it in ArcMap 10.2 ModelBuilder but the following error ...
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28 views

Does raster intersect polygon in ModelBuilder?

In ArcMap, I'm building a model which is iterating over ArcGrid rasters. I only want the steps to run where the raster intersects with a certain polygon. How do I add this condition to ModelBuilder?
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71 views

Why do I get “Insufficient memory for image” although there should be enough RAM?

QGIS reports "Insufficient memory for image 1403x716", when I want to load a raster. The problem begins after 1 hour of work. Had somebody had such problem? System win7 64 bit, 16GB RAM, Intel Core ...
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36 views

Creating a Grid For Raster When Measuring Land Cover In Accuracy Assessments

I am assessing the accuracy for the 2011 National Land Cover Map (NLCD). Each pixel for the NLCD measures 30m x 30m. For my reference data, I'm using two sources: 1) Google Earth (~20 m ...
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23 views

Repeatedly losing data sources for raster layers in ArcGIS for Desktop?

I have several raster layers that keep losing their data connection whenever I add a new layer from running a tool. I repaired the data source, but this keeps happening every time I run a tool. Is ...
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48 views

Distance to nearest cell with value “x”

I would like to create a raster where each cell equals the distance to the nearest cell >= the value of the source cell plus a constant. In the example below, the input raster has a grid size of 1m x ...
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21 views

Zonal smoothing on a specified area of a raster?

Is there any way to smooth a specify an area on a raster, such as a DEM, and smooth it? For example, I'd like to smooth out the artifact highlighted in the red box. What is the best course of ...
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33 views

How to get the pixels from a geotiff file in gdal python for a given polygon?

I use python and GDAL under apache to make a webservice. I have a GeoTIFF file and i want only a subset of the data, everything inside one polygon defined by a buffer of a line (coord is the input ...
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31 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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20 views

How to save symbology for raster and also its associated 'value' (using unique values)?

I have a raster in ArcMap (built using sum function in cell statistics), and only want to show the water parts of it (band 128). In doing so I only need to show multiples of 128, however there are ...
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29 views

Percent coverage of a polygon in a raster grid

I have a wooded area polygon and a study area grid of cells with 300m resolution. I would like to calculate a raster which shows the amount of each grid cell covered by the polygon. The density per ...
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38 views

Zonal Statistics with very large mosaic in ArcGIS

I have the complete National Elevation Dataset from USGS in over 3000 ArcGrid files (coming to almost 190 GB), and a polygon shapefile of Colorado counties. I'm trying to use ArcMap Zonal Statistics ...
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56 views

Loop over pixel data using Python in ArcMap

Further to my question on SO I'm trying to check the validity of bitmaps. Mainly for transparent or black pixels. I'm new to ArcMap, and I now know that Python scripts can be run from Arc. Any ...
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1answer
55 views

QGIS georeference raster to world file (WLD)

I am trying to georeference a raster (jpg). I can easily create a geotiff, but when trying to use the QGIS georeferencer to create a wld file instead, something goes wrong. I have the target CRS set, ...
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63 views

Is there a tool to shrink/grow raster data edge by n pixels

Looking for an open source tool to grow/shrink raster edge by n pixels. I noticed Grass has r.grow but hoping there might be a way to do it with GDAL, PostGIS or python library. More information: I ...
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38 views

Reassigning raster values by looking for nearest pixel in another raster using QGIS?

I have two non-overlapping rasters, A (red hues) and B (blue hues). I want to change the value of pixels in B via a nearest-neighbor search in A; i.e. a pixel in B with a value of 15 looks for the ...
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23 views

Clipping raster Data: Converted from GeoPDF to .tff. to .lyr

Program: ArcGIS 10.3 Need: Trying to get a free basemap for georeferencing a historic map so that I can overlay it in my project area. Attempted to use ESRI's USGS National Basemap so that I could ...
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2answers
35 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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18 views

Dynamic style for DSM layers in geoserver

I have lots of raster layers to show DSM under GeoServer 2.8.2. The input file is the one band TIF served with ImagePyramid plugin. Could I set a dynamic style which related with min and max values ...
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43 views

NDVI polygon from NDVI raster

I am currently working with NDVI data. I found this format which seems to be preferred by our clients: Our maps are made in ArcGIS, I've tried running classification but classes won't allow me to ...
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27 views

Intersect with Raster data

I have ArcGIS 10.2.2 I have raster data over a whole state but am looking at just analyzing a specific county. I downloaded county polygons to overlay over the raster data to determine the area I ...
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115 views

Raster calculator: Insufficient memory available for operation

I use QGIS 2.14 (Windows, 64bit) and try to do some raster calculations with EUNIS habitat data, filter for specific habitat types, files are about 3 GB. RAM: 8 GB (7,85 GB usable) Virtual RAM: 8043 ...
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116 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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1answer
40 views

Erode pixel areas in QGIS

I try to resize Pixel segments exported from eCognition. The goal is to erode the segments for one pixel of the boarder. So for example if the segment is 30px x 30px the result should be a new area ...
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11 views

I got the tiles of a raster and I would like to create the original raster

I got the tiles of a map named txt 2x0x0.png 2x0x1.png ... 2x1x1.png 2x1x2.png ... 2x45x1.png 2x45x2.png The first part is the zoom, the second the row and the las the column number. Is it ...
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25 views

Probabilities matrices and cellular automata in IDRISI

I apologize for asking about such elementary things, but I am utterly new to IDRISI yet am now having to learn how to perform certain tasks with it on very short notice. Am I right that, when Markov ...
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49 views

Downloading GIS Map for Pakistan into QGIS

I'm looking to add canals and bunds to my raster and have found some GIS maps at: Canals Bunds Bunds Image Network Plan Map Image - looks to contain both canals and bunds I'm not clear on how to ...
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74 views

How to save imagery from online raster service for offline use?

QGIS allows me to connect to free map services like ESRI's 'world imagery'. I would like to save a certain part of it (decided by map extent) in the highest zoom level available in the service for ...
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60 views

Change the values of NA cells in a raster by using a geographic subset of the raster as a condition

I would like to replace the NA cells that are within a specified extent (here rectangular area defined by drawExtent in the code bellow) of a raster object. My idea was to use the functions ...
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20 views

SAGA Flow Direction input

I have several .adf files making up a DEM in ArcGIS, i want to input this DEM into SAGA to run some different Flow Direction algorithms. Is there a way to convert these files to .asc to allow me to ...
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98 views

How to remove parts of raster layer with QGIS (equivalent of difference tool but for raster)?

I'm trying to get the difference between two raster layers the same way we can do it with the difference tool with vector layers. I'm using QGIS 2.14. Anyone has already done that and can tell me how ...
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179 views

How can I make QGIS interpret coordinates as long-lat instead of lat-long

I am working with the TRMM 3B31 files on precipitation provided by NASA. When I load them on QGIS selecting the WGS84 projection together with other shape files the maps are displayed vertically, i.e. ...
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26 views

Mouse-over raster surface to stream values to text file ArcGIS

This is a weird one. I have a user who wants to add a statistical surface to ArcMap and then mouse-over the raster surface and stream those values (z) to a text file. MouseTips can show underlying ...
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46 views

comparing rasters, cells that have changed value

I am attempting to compare two rasters representing a species distribution model for now and the future. The rasters have the exact same extent and cell sizes. here is when is gets tricky, they are ...
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59 views

PostGIS: MultipolygonZ to floating point raster

I am trying to convert a table of MultipolygonZ geometries to a floating point raster where the pixel values of the output raster will be derived from the Z values of the MultipolygonZ geometries. The ...
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49 views

Create raster with decibel value from Geotiff Intensity using QGIS GDAL python

I have raster with intensity values and I want to create raster with decibel values, I work with QGIS GDAL, I use gdal_calc I do this from the terminal: gdal_calc.py -A input_image.tif ...
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31 views

Multiple raster - same extent - smallest overlapping area

Within ArcGIS (10.1) I have multiple raster files, for which I have to calculate different statistics, based on the total size of the raster. EDIT: The raster have the same extent on a coarse scale ...
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113 views

Raster style based on percentile QGIS

Is there a way to get similar raster styling in QGIS as ArcGIS does with classified raster data based on percentile scores? In other words, I want an equal number of pixels in one color for my entire ...
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3answers
63 views

Statistical Analysis of Climate Data

I am doing a study on how a changing climate is influencing the spread of an invasive species of moth. I have climate data in the netCDF format which I have made into both rasters and point ...
3
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1answer
164 views

transpose large netCDF with GDAL, NCL, NCO or CDO

I have a large netCDF file (444GB) that I would like to transpose. The file is flipped with latitude on the x-axis and lon on the y-axis. See pictures of one band below. Not correct Correct: I ...
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19 views

How to make match two same rasters after conversion "Polygon to Raster?

I am trying to convert two .shp files of polygons of same buildings but with different layers of values into raster. When I do conversion from polygons to raster it always generates bit different ...
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45 views

Edit script to use in ArcGIS-R-Bridge

I have an interpolation script running in R which I now want to implement into ArcGIS so I can use it independently with any shapefile. To get to a result I scripted in 3 steps: Original R script: ...
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8 views

Problems with Mapnik raster colorizer discrete not properly assigning values to their stop value

I'm using Mapnik (Python) to convert a raster (float valued) to MBTiles. In general the discrete colorizer is working fine, except for zero values, where it fails to recognize their correct stop ...
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34 views

PostGIS: intersection of a MultipolygonZ and a floating point raster

I am trying to isolate the pixels in a floating point raster (loaded in PostGIS) that intersect my MultipolygonZ table (also loaded in PostGIS) and whose values are less than or equal to the z values ...
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25 views

Combine tool: Does it perform a union or intersect operation?

Can I use combine with different shaped rasters? Does it perform a union or intersect algebra operations with the fields?
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2answers
34 views

How can I alter the value field in a raster?

I'm using ArcGIS. I have a raster with angles in the value field. But the value field is type long integer. I would like to change it to float. Is that possible? Some more details: I've started with a ...