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

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Create RasterDataSet from 2d array

How i can create RasterDataset using a 2D double array : double[][] pixels OR float[][] i tried tow ways using IRasterDataset 1- IPixelBlock outBlock = outRawPixel.createPixelBlock(pnt); ...
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31 views

Problem rendering raster in QGIS

I have a problem with some Landsat 8 bands combination. I created a multiband (1 to 7) file in order to avoid the creation of several files with combinations and instead, have all the bands in one ...
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21 views

Creating raster from points that conforms to a reference geometry using PostGIS, python, QGIS

Please forgive my ignorance, I'm fairly new to processing GIS data. My bread and butter is statistics but I'm now working on a project that requires more data preprocessing and cleaning than I've ...
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31 views

Overlay polygons on raster in different projections

I'm overlaying polygons on a raster to get the average value inside the polygon (using SAGA->Shapes-Grid->Add grid values to shapes in the QGIS Processing Toolbox), using a geographic and a ...
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24 views

Weighted Overlay not showing all values

In a ModelBuilder, my final step is to add a weighted overlay at the end. I have 4 reclassified layers as the input, all equally weighted and all contains values 1-10. However, when I run the Weighted ...
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36 views

Project Raster Data Loss - 2 Billion People

I am using the SEDAC/CIESIN raster data for population counts. This data is in WGS1984, and I want to project this data to a Fuller projection. After running through "Project Raster" in ArcMap 10.1, ...
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30 views

Point to Raster Converting Result

I had a problem with Point to Raster converting result. I had an Excel file which contains x, y and z values. I wanted to create an individual raster data from classified z values so I planned to use ...
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25 views

How to avoid a problem of one pixel when doing non-linear regression?

I am ruining a non-linear regression using nlsLM from package:minpack.lm for multiple rasters (pixel by pixel). My initial values may be appropriate for some pixels but not for others.When I run the ...
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45 views

Can't import libraries to rsaga

I get this error when I'm trying to import a raster to RSAGA: > rsaga.import.gdal(paste(rast_name, ".tif", sep=""),"RASTER", env= my_env) Module 'GDAL: Import Raster' not found in SAGA library ...
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16 views

Creating a time series from multiple rasters in ArcGIS

I have 10 rasters (10 yearly averages of data) that I've uploaded into GIS. I would like to do two things: Create a time-series of the values of that raster at one specific point within it. Create a ...
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33 views

crop shp file leads to different results for same extent

I cropped a shapefile to a smaller extent (my AOI - area of interest) - to work with a reduced working directory. During my workflow I rasterize the shapefile. Here is my problem: I saved both of my ...
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59 views

Mosaic to New Raster: Problem with min and max values

I have to combine several DEM rasters into one from this source: http://srtm.csi.cgiar.org/SELECTION/inputCoord.asp, so I use Mosaic to New Raster tool. I set up the tool: 1) I input the rasters (all ...
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51 views

Raster to polygon with RGB composite using Arcgis

I am trying to convert an RGB composite to a shapefile to use with. The raster to polygon function returns with three shapefiles with "grid_code" of the value of each of these three channels. I am ...
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27 views

Problem with conversion from raster to polyline (not a single curve)

I have raster file and I need to convert it to line. I used GIS tools Convert Raster to Polyline but the line segment is not straight and it is divided into no of segments, isn't it possible to get ...
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71 views

Apart from “in-memory” space and physical geodatabase, is there any other method to process raster data?

Using the centroid of the building footprints (tagged residential), I want a count of hydrants within 135m, and a count of hydrants within 270m of every residential footprint. This would be based on a ...
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17 views

How to import Esri Raster to IDRISI with NoData value?

I made some point features in ArcGIS Desktop to build training samples to import to IDRISI. I had 7 classes and convert the feature to raster to build the signature in IDRISI. When I import the data ...
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19 views

Aligning to DEM after TIFF conversion to GRID?

I can convert a TIFF (NASS Cropscape) by using Create Raster in my .gdb or Export to other Format. However, all efforts to align the extent to an existing DEM have escaped me! I have tried Snap ...
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43 views

Use NASA data (.grd) in ArcMap 10.2?

I am trying to use soil texture data from NASA (http://ldas.gsfc.nasa.gov/nldas/NLDASsoils.php#VIC), but I cannot figure out how to use the .grd file type in ArcMap. I have tried to save as .asc and ...
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44 views

How to randomly generate 3 X 3 pixel window/grid size in ArcMap?

I have a raster image in ArcMap and I want to assess the accuracy of my raster image with a reference image. So, I need to randomly generate a bunch of (i.e 50) 3 X 3 pixel window/grid size from my ...
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80 views

Convert GeoTIFF Raster to JSON?

So I need to convert raster data to JSON format. Is the best way to do this to convert the XML files associated with the rasters to JSON? ARC Map has a tool to convert vectors to JSON, but not ...
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26 views

How to visualize a C-band SAR sensor measurement

Files: \measurement\s1a-iw2-slc-vv-20141205t171642-20141205t171705-003587-0043c5-002.tiff Size is 24435, 13472 Coordinate System is `' Metadata: AREA_OR_POINT=Area TIFFTAG_DATETIME=2014:12:05 ...
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37 views

Downloading data after clipping

I have an issue with downloading data from GeoServer after clipping layers: 1. I can download vector layers as GeoJSON and GML, but cannot download as shape-zip: file becomes corrupted; 2. I cannot ...
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34 views

ClipRaster Class of DotSpatial is problematic

I want to clip a raster data with a polygon extent. Here is my Layers. Polygon layer is colored and raster is black and white. When I cliped using ...
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21 views

Can a raster be projected twice?

I have to georeference a raster (tiff) twice. That is due to the limitation of control points I have. The first georeferencing works perfectly. The problem comes when I georeference the raster for the ...
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42 views

How much does relatively up-to-date 1 meter resolution color satellite imagery cost?

I'm starting to realize that I'll probably have to pay for good satellite imagery, and the sites I've been to so far want me to call them to ask for price quotes. I'm wary of this and haven't done it ...
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37 views

Calling each pixel using spatial modeler language of Erdas Imagine?

How to call each pixel from a 4 layered raster image using while loop of spatial modeler language in Erdas imagine 2011? I need to consider each pixel as a 4*1 matrix and want to calculate the ...
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26 views

How to combine two `GridCoverage2D` to make a new `GridCoverage2D`

I was wondering if there is any GeoTools code example which combines two GridCoverage2D to make a third new GridCoverage2D? I can find examples for reading pixels from GridCoverage2D or writing a ...
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34 views

OSGEO/GDAL and Rotated Pole Grids

I have a netCDF containing a raster in a rotated pole grid. I have a script for converting the desired information to GeoTiff, however it requires projection information in the form of WKT string. ...
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16 views

Geospatially match cells of different rasters - possible?

I have 2 rasters that were originally vector polygons. Raster2 was created from a selection of raster1. After converting both to raster, their cells don't match up (i.e. attribute info for each cell ...
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19 views

QGIS multiply(add) two raster but divide(deduct) another raster

I am making a parking analysis in one town. I need to obatin the zones where the parking of car is harder because there is less places to park and higher demand of cars.I have three rasters. First ...
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25 views

View Oracle GeoRaster in ArcMap

I have imported SRTM DEM into Oracle 11g using FME.The block size is set to 128X128.I am able to view the data in QGIS,Tatuk and play with it using GDAl command line.Unable to view the same in ArcMap. ...
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Unable to execute the algorithm using SAGA LS factor

I tryed to calculate the LS Factor at SAGA, using a slope raster and the area raster, both at the same EPSG, and the error:Unable to execute the algorithm the error means something with the coordinate ...
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31 views

How can i perform area calculations in a raster file?

I would like to know if is possible and how can i calculate all areas or parts of it in one raster? Can i do it using the raster calculator? All help is appreciated, Best regards
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22 views

How to get background maps to show in QGIS Cloud mobile version?

we're a group in Denmark, trying to publish some maps for use on a mobile device, but although our background maps show up in the desktop version, we can't get the mobile version to show them - What ...
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42 views

How to run GAM with raster package?

When I am using the raster package to predict a surface probability map of species distribution using the following functions in R, the following error occurrs: CA132122200=raster("F:/CBG ...
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24 views

QGIS Export section from raster to AutoCAD

QGIS Windows 7 I have a raster which displays the flood depth over my site. What i would like to do export to AutoCAD an outline (maybe as a polygon or line) of the sections of the raster which are ...
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49 views

Clip .hdf (MODIS) rasters by shapefile

I am trying to do a temporal analysis on vegetation quality so I downloaded a MODIS .hds raster from earthexplorer. When I opened the file into ArcMap 10.2.2, it came as a group of 11 rasters. I stuck ...
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73 views

how to use raster layer (map image) as base layer in geoserver+openlayers and vector layers on top of that?

I am using Openlayers + Geoserver for rendering data on India Map. I am able to do it. However, the India map generated from Opensource shape files doesnt look good. So, I want to use Better India ...
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34 views

Updating/replacing GeoTiff data store on file system causes GeoServer to halt

I have a few hundred raster layers that are updated at least 4 times a day. The GeoTiff's are updated directly on disc. I'm running it as a windows service and I can sell the wrapper app logging the ...
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61 views

How to speed up raster/map algebra in PostGIS?

I am testing map algebra with PostGIS (2.1 with PostgreSQL 9.3) on two images, and found it to be rather slow. For example, dividing two images of 7200 * 3600 pixels took 110 ~ 120s on a desktop with ...
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33 views

A Distributed Cost-Distance Algorithm

I'm currently trying to implement a distributed cost-distance algorithm, however I can't seem to invent my own and still make it fast. I've been googling around a bit but haven't found anything that ...
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21 views

Raster import problem

I have raster images (orthos) and feature layers in a GIS program (Global Mapper). When I import these files with the same CRS into QGIS they are literally 9000 miles apart and I cannot figure out ...
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17 views

How to summarize canopy cover at a minimum mapping unit using ArcGIS

I am working with Landfire data and I have a project which requires that there be no area under 10% canopy cover at a 5 acre scale. I am going to use the Landfire CC2010 data and use a 5 acre moving ...
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91 views

Scatter plot of two rasters in arcmap for intersecting cells

How do I make a scatterplot of two rasters in arcmap which will plot the two rasters' cell values of the same cell against each other (for every cell where they intersect). I need to first create a ...
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25 views

Has anyone success using subset an image such as NAIP?

Has anyone any luck subsetting a small part out from NAIP? I'd like to hear your feedback on pros or cons on how to subset an image from NAIP despite they are in mrsid and their uncompressed file size ...
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104 views

QGIS raster symbology problem in 2.6

With the new 2.6 QGIS version I often have problems with raster colors. For some reason certain pixels do not display initially, but if I move the raster a little spatially they show up.
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33 views

Adding Raster Layer in C++ application always result in layer invalid

I am trying to add a raster layer in c++ application with QtCreator and QGIS 2.6.0. My code is as follows: QgsRasterLayer * layer = new ...
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93 views

Reclassify raster value

I'm curious if anyone has been able to change one individual value in a raster file? I'm using Arc 10.2 and trying to change the value 99 to -2 for 144 files using model builder. So far, I've only ...
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22 views

Change “World Size” with gdal2tiles.py

When I use the flag "-p 'geodetic'", the output is a world that is 512x256px at zoom level 0. In order for it to overlay with other datasets, I need it to be 640x320px at zoom level 0. I am looking ...
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22 views

Script Efficiency

I have been working on a script to read pixel values and print the values out to a text file. This is currently working but takes around two hours with a 6.6gb file. This is to replace an older script ...