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

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weight a raster by another for a model ( R/ arcgis/maxent)

I have an idea in mind for my project but I can't figure out how to do it in R and Arcgis. Basically I would like to do a weight a raster by another for my maximum entropy model. -I got a raster ...
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5 views

joining attributes for .img files in erdas

I have numerous .img files of the same region and spatial resolution. In Imagine I would like to join all the attributes together into one .img that I may import into r for model predictions. Not ...
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1answer
51 views

How to round pixel values of a raster in QGIS?

I have a raster with float number values for example: 2.544459104537964 and I want to round these up to intergers. I have seen other posts on ArcGIS like this one but when I use Raster Calculator in ...
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2answers
51 views

Calculating forest connectivity for raster

I'm trying to calculate some sort of forest connectivity value for each pixel in my land cover classification. I would like to do this by calculating how many other forest pixels are directly ...
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1answer
51 views

How to separate details by color from raster?

How to separate details by color from raster? Is it possible in ArcGIS or any other software? I have tried Spatial Analyst. I want to use RGB .tiff image which is scanned map. It consists of all the ...
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44 views

Raster dataset analysis in ArcGIS for Desktop?

I have about 12 raster of different extents ie others have large extents. The problem is that when trying to overlay using weighted sum ... The output relies to the small extent only. I want it to ...
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27 views

Help Summing Raster cells to equal circles with a specific sum

So I have this application user density data that I've collected. Each gps point has a user density associated with it (for example: 150 users within a 1 km radius, which calculates to users/[pi*R-sq] ...
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1answer
31 views

Sequential rasters - when did point x change

Using ArcGIS 10.1 with Spatial and 3D Analysts, and Python 2.7 I have a series of reclassified rasters in which every cell is either one or zero. I need to programmatically create a single raster ...
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18 views

GDAL Python and postgis raster?

I'd like to create a postgis raster using GDAL and python. I can get the driver easily: drv = gdal.GetDriverByName("PostGISRaster") But how can I create a new raster table? I can't find any ...
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28 views

Modifying DEM elevation data in QGIS using a polygon

I've tried searching through the existing questions but am struggling to find a succinct answer to what I am trying to achieve. For background, I am running a flood model in TUFLOW to help support a ...
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1answer
23 views

How to combine two rasters based on the relationship to a polygon mask?

I am looking to combine two single-band, 1-bit rasters of the same spatial extent based on their relationship to a polygon (mask). The image shows a polygon displayed with a cross-hatch and the two ...
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2answers
118 views

Calculate scale of a raster

A raster has a cell size of 200 meters. What is the corresponding scale of the raster? New to GIS, using ESRI, semester is almost over but this one question is confusing. I didn't think you could ...
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29 views

In ArcSDE, SQL Studio Manager 2012, How to get pixel data using a point layer?

I was using 'where' and 'ST_Intersects' with polygon data to get values 'under' my point layer. Example: Select rd.[FORESTNAME] as Forest, Count(Distinct morel.[OBJECTID]) AS Observations From ...
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27 views

How to check if a file is a valid raster image?

How to check if a file is a valid raster image? Valid in the sense of not being corrupt, the file record is complete. The GIS corollary to "zip --test somefile.zip" to test if an archive's integrity ...
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19 views

Using mask to several raster datasets with same cell size, extend and row/column in ArcMap?

I have a raster dataset "substrate_W84" that I would like to use as a mask in order to create several raster dataset with the same cell size, extent, row/column (to be used in Maxent). ArcMap 10.0 ...
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23 views

Uploading raster to ArcGIS Server dynamically

I am building an new web tool related to agriculture research, this tool is linked to another backend GIS process done in c# and ArcObjects. I want to find a way to visualize this backend output ...
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13 views

Using QGIS to create a single # band raster Image [duplicate]

I recently downloaded some Landsat Images. They are in GeoTIFF format. The images are in the different bands. How can I combine them for example if band 1 is Red , band 2 is green and band 3 is blue, ...
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1answer
20 views

How to make Feature to Raster tool run faster

Suppose you have a feature class that you need to convert to a very detailed raster (where each cell size is quite small). With a cell size of 0.0092908447 in the Feature to Raster tool, the procedure ...
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43 views

How to create shadows of buildings with r.sunmask?

I need to create image-raster with shadow of relief and shadow of buildings in one. I know how to create shadow of relief but how i can create shadow of buildings with r.sunmask? I dont know how from ...
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30 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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2answers
37 views

Hosting Rasters as a Tile Server

I am currently trying to serve a Raster Datasheet made from several Geo(TIFF) files but I am unsure about how to go about it as I'm quite new to GIS! I need to host it online so that clients can ...
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22 views

How to run Focal Stats on specific values in python

I'm a beginning programmer and am new to the site but it has helped me quite a bit so thank you! I'm trying to recreate a raster calculator operation using python scripts but am having a hard time ...
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27 views

How to expand a floating point raster by one pixel

In ArcGIS 10.2.2, I have a floating point raster of oceanographic data that boarders a coastline. Due to the jagged edge of the coast, the raster edge only sometimes overlaps the coastline and leaves ...
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25 views

How to set floating point raster values to NoData when raster does not have valid statistics

I have a raster with some values of 99999 that I want to set to NoData in Arc 10.2.2. I've tried using the SetNull dialogue box, the SetNull arcpy function, and the Raster Calculator dialogue box as ...
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2answers
32 views

gdal_calc : fails with value 0?

I working to invert values of a one-band tif files (download sample). If i use 254 it works: $ gdal_calc.py -A ./shadedrelief.tmp.tif --outfile=whited.tmp.tif --calc="254*(A>180)" 0 .. 10 .. ...
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30 views

How to view a postgis raster query in QGIS

I have successfully loaded a large number of .asc images (>2800 200x200 tiles) into a Postgres table with PostGIS 2.1 support. The new table appears in QGIS's DB Manager and I can add the whole image ...
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30 views

qgis2threejs - rendered surface edges “bleed”

I am using qgis2threejs on some raster datasets representing different potentiometric surfaces of aquifers. The rendered 3D images from qgis2threejs have the edges of the surfaces "bleeding" down to ...
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1answer
41 views

Extracting point information from raster in R

I'd like to work with climate data available from here and extract values of certain locations (for which I have lat and lon). This is what I've done so far: library(SDMTools) library(raster) test ...
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2answers
54 views

How can I loop through a list to create rasters and write them to .tif files?

I received 3 .mat files that each contain several daily maps. I need to take them and get them into ArcMap (10.2 if that matters) as a .tif with spatial information. I have already used the R.matlab ...
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2answers
53 views

Getting information out of an ArcGIS .lyr file

I'm using ArcGIS 10 and I downloaded a Raster layer from here: http://bioval.jrc.ec.europa.eu/products/glc2000/products.php When I unzip it I get the following files: 1 Aux-File (15KB) 1 ...
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35 views

Using QGIS in medical Science? [closed]

I was wondering if anybody would be interested in collaborating? My Idea is using QGIS to analyze and quantify Immunofluorescence raster images of cells from human serum.
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37 views

How to mosaic to new raster for multiple DEM tiles?

I took some DEM files and turned them into raster .tif files, i then tried to Mosaic them together using the mosaic to new raster tool and i keep getting two problems consistently, there seems to ...
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2answers
152 views

Classifying DEM according to elevation in R?

r<-raster("DEM.tif") How to do the classification based on every ten meters for example and have different colors too?
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2answers
72 views

Generate PNG/JPG maps from multiple ASCI/GeoTIFF in Python/GDAL

I need to generate maps (saved in PNG, JPG or PDF) from raster files (for each file - one map) which meets following criteria; * each map has exactly the same color pallette, so that it will be easy ...
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3answers
43 views

Want cell linear regression values for a netCDF or multi-band raster

I have climate raster type netCDF data. I want the slope and other regression statistics of temperature for each cell over time. I have read that GEOV IDL can do a temporal regression to achieve ...
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RuntimeError: ERROR 010240: Could not save raster dataset to G:\GHY_568\project\FlowDir_beth1 with output format GRID

import arcpy from arcpy import env from arcpy.sa import * arcpy.CheckOutExtension("Spatial") env.workspace = r"G:\GHY_568\project" #mystery_creek = r"G:\GHY_568\project\Mystery_Creek.shp" ...
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1answer
75 views

Difference between raster() and readGDAL()?

I am new in working with rasters and after having trouble working with them i'd like to know the difference between those two import functions. for example i did this library(raster) ...
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20 views

How to specify raster name and how to designate the saved name of a created raster

import arcpy from arcpy import env from arcpy.sa import * arcpy.CheckOutExtension("Spatial") env.workspace = r"G:\GHY_568\project" mystery_creek = r"G:\GHY_568\project\Mystery_Creek.shp" ...
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21 views

How to calculate probability of binary outputs of n iterations without saving each individual layer?

I am trying to calculate mean raster of n runs in model builder each run creates a binary raster which represnt whether a flood got to a pixel or not i want to calculate the probability for flood in ...
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36 views

Different obs. when I extract raster values from polygons in R

I have two raster layers with the same projection, extent and resolution: r1: class : RasterLayer dimensions : 33434, 89431, 2990036054 (nrow, ncol, ncell) resolution : 0.001447053, ...
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77 views

Large Rasters in ArcGIS & MapInfo

My geoscientists like to work with MapInfo and ArcGIS. I require a common 1 band raster format that can hold obscene amounts of data without damaging the data (compression). I have tried .tif and ...
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31 views

Extract value from Raster data by elevation

I have one raster data (AVHRR NDVI value) and one dtm data (elevation value). Is there anyway to know the NDVI value by 50m interval elevation? For example, I wanna know what is the NDVI value for ...
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1answer
37 views

Resolution problem in QGIS raster

I have a raster file I need to clip. I created a virtual raster which I used to "copy" the extent from in QGIS raster calculator. As a result, I get the raster with the extent I need, but pixel size ...
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22 views

Raster to point: 10 rows in the attribute table per 1 point

I have just made Raster to Point operation. In the output, if I select a point on the map, in the attribute table appear I have just selected 10 rows. How is it possible? Where, in the Raster to Point ...
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1answer
52 views

How to change no data value from -32768 to -3.40282e+38 in raster in QGIS?

I am trying to change the null values of a raster from -32768 to -3.40282e+38 in QGIS. I tried using warp tool setting the no data values to my desired number but it did not change it. Then I used ...
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19 views

PostGis - ST_AsRaster returning raster smaller than reference raster

I am trying to convert a point geometry to a raster using a reference raster: SELECT ST_AsRaster(my_points, ref_raster) FROM my_table This works fine except it is only returning a subset of the ...
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16 views

Raster Copy: Output bit size does not match specified value

Using ArcGIS (Map/Catalog) 10.0. I have a raster file (kdens) developed from point data using the kernel density tool. It is 32-bit float file format. I need this file converted to a polygon ...
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9 views

Use of OTB BandmathX

I have a couple of three-band satellite images that I want to apply an expression to and get a three-band output. The expression is of a simple form: output_pixel= (input_pixel*d^2)/cos e After ...
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2answers
29 views

Include non-raster object in overlay function in R

I have two raster objects and I would like to calculate values of the first conditional on values in the second. I am currently using the overlay function, but unfortunately I can't seem to pass non ...
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1answer
24 views

Combining continuous raster and point in ArcGIS for Desktop?

I have a layer that's a topographic map of a mountain range, represented by a continuous raster. I have another layer that is just points, representing where the summits are. How can I use the ...