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

learn more… | top users | synonyms

1
vote
2answers
143 views

Batch Fuzzifying with ModelBuilder

I am trying to run the Fuzzy Membership on simultaneous rasters in ModelBuilder and I am running into the problem (or bug) where it allows me to change the "Membership Type" but ends up defaulting to ...
2
votes
2answers
325 views

SPOT NDVI time series

I have 423 spot.vgt ndvi from first April 1998 till 31 Dec 2009. I want to know how to stack these NDVI to have one image for time series analysis? Or better to ask how is it possible to analyze a ...
2
votes
2answers
1k views

How can I use GDAL to batch define a projection?

I have a fodler with 1500 ECW rasters, no spatial reference information defined. Can I use GDAL to batch define a projection for all 1500 in the folder?
1
vote
1answer
369 views

Having issues removing white background from Raster images

I've got an issue with 4 raster layers that I have converted from kml files into layer files. It would only allow me to convert them if I used ground overlay and now the 4 raster images are ...
0
votes
0answers
79 views

QGIS: “No data” raster value for missing rows conflicts with data?

I’m having a problem with specifying “no data” in a raster dataset in QGIS 1.8.0-Lisboa. QGIS does fine in interpreting pixels I don’t have rows for as “no data” if I set Layer Properties -> ...
0
votes
2answers
116 views

How can I see average of raster value over certain area, marked by mouse?

I have a raster in Quantum GIS and I am just exploring it. How can I see average of raster value over certain area, marked by mouse? In other words: How can I select particular area in QGIS? How can ...
3
votes
1answer
68 views

Speeding up raster to point set function

I have written the following function that takes a raster (always non-skewed) and returns a set of points. As I'm executing it millions of times in my queries, I'd like for it to be super-optimized ...
4
votes
3answers
843 views

Loading raster data to postgis

I'm a newbie in GIS technology and need some help in loading a rainfall radar raster data into PostGIS. The raster image is shown here: What I need is to store in the database the radar ...
2
votes
1answer
1k views

How to overlay two raster layers

How to match two raster layers, I have one raster and a shapefile and I want to convert the shapefile into raster BUT I want it to have the same cellsize and its cells overlay (same positions) to the ...
5
votes
1answer
1k views

ArcGIS - make linear regression across multiple raster layers

I have a series of 5 rasters which represent a value for 5 consecutive years. Is there a way to create a linear regression for each cell over the 5 layers and output the slope? The result would be a ...
2
votes
2answers
635 views

Select maximum values from list of raster layer : ArcMap10

I have 10 raster layers. Each layer has the dimension of 100 columns x 100 rows and actually are temperature values from year 2000 to 2010. I want to ask ArcMap to produce a raster layer that ...
1
vote
1answer
183 views

Aggregating a raster to fit a polygon grid

I am working at the scale of 10 square km grid cells for the UK, and have a polygon layer of the Ordnance Survey 10k grid cells in ArcGIS. I have another layer of the human footprint index, also for ...
3
votes
2answers
207 views

Resolution difficulties in Grass

I have gone through similar questions to mine here, but I didn't find a solution. Please help! When cropping a raster image by using g.region & r.mapcalc, I get a new image but the resulting ...
1
vote
2answers
487 views

Parallel Computing and Raster Operations in ArcObjects gives cryptic error

This is a problem I have been struggling with for awhile. The code below takes 1-3 input feature layers (pFLayer) that were stored into a list called pFeatureLayerCollection, casts them into ...
1
vote
2answers
211 views

Read raster value at mouse position

I have raster layer imported in QGIS. How can I read value of the variable represented by the raster at mouse position? I just have a new raster layer and I want to read values at random places to ...
0
votes
0answers
92 views

Why does a shapfile shift after transformation?

I have a shapefile created in the raster package (ER_14.3_2000_poly). > #read in a raster file > ER_14.3_2000<-raster('E:/Ecoregions Models/Outputs/ER_14.3/ER_14.3_ConsensusMap3.asc') > ...
0
votes
0answers
46 views

How to reclassify raster data on a scale of 0-1? [duplicate]

I have various raster layers generated after using euclidean distance tool. How can I reclassify them on a scale of 0-1 instead of 1-10, etc?
0
votes
1answer
596 views

How to run an AML in Python?

I am trying to run an AML in a python program I am writing and haven't been having much luck figuring out the correct way to run the AML. The AML requires ArcInfo Workstation to be from the GRID ...
0
votes
1answer
145 views

Installing raster resampling module in QGIS 1.8

On the website of Sourcepole, I have recently come across the case of resampling images in Quantum GIS. Because I am rather a beginner in GIS software I would like to ask you for information about how ...
2
votes
1answer
176 views

Several algorithms done for topographic correction => black spots - how to solve?

I have done several algorithms for topographic correction in R including simple cosine, Minnaert, SCS. The input data aspect and slope for the hillshade raster have correctly been done in radians. The ...
2
votes
1answer
212 views

How to get mean of pixel values within a buffer zone around current mouse position in QGIS

for a qgis 1.8 python plugin I want to query the mean of all pixel values of a raster layer within a defined buffer around the current mouse position, not for an existing point layer. For the buffer ...
0
votes
1answer
191 views

How to draw a custom map on top of base layer

I'm looking for the easiest way to draw a custom layer and export it as a tile cache. Basically what I would like to be able to do is load a base layer, and then draw objects and annotations on top ...
4
votes
2answers
147 views

How to create a single contour defining the boundary between sea and land

Hello! I am still learning so forgive me if my question is very simple... I am trying to create a map with ArcGIS. The area I am working on is a seasite and I found that in some parts the cells appear ...
1
vote
1answer
770 views

How to save R raster plot for ArcGIS raster file

I want to save my raster plot that produced with R to ArcGIS raster (.img, .tif and ASCII) file.
-1
votes
1answer
313 views

Raster produced by Con expression not saving

I cannot get a Con expression to work. Or, if it is working, I cannot get the raster produced by the Con expression to save. I have two rasters and I want the positive difference between the two, and ...
0
votes
1answer
254 views

How to publish raster data in Arcgis Viewer for Flex?

I'm new to ArcGIS for Server and I would like to publish several raster layers (land surface temperature, NDVI etc.). I have uploaded raster to server, but I cannot add it to my ArcGIS viewer for ...
1
vote
1answer
171 views

What does “Computed -srcwin falls outside raster size” mean when clipping?

What does this mean, when I try to clip and save the result as a sqlite or other format please? "Computed -srcwin falls outside raster size of 7807x4771" cheers, Bruce
3
votes
1answer
2k views

Setting extent and geographic projection in R

I have a raster and a shapefile that I am attempting to view and process in R. The shape file "ER_11.1" has the following specs: > ER_11.1 class : SpatialPolygonsDataFrame nfeatures : 22 ...
2
votes
1answer
550 views

extracting data from rasters using shapefile boundaries in r

I have a raster.stack of 8 environmental variables and a shapefile of Ecoregions for the southern U.S. files<-list.files(path='E:/Ecoregions Models/Border Bioclim/',pattern='asc', ...
1
vote
1answer
215 views

How can I bring in grid files from Geographix into ArcGIS?

I have a set of grids of subsurface horizons, created from contours, that I have created in Geographix and am having trouble brining them into ArcGIS. Currently when I try to export the grid ...
4
votes
1answer
136 views

Weird raster visualisation

Using the hillshade tool (Arcmap 10) on a 30m SRTM raster downloaded from NED the result is the one in the picture. Why are there those crossed lines all over the raster? How could I remove them? ...
1
vote
1answer
1k views

Geoserver ImageMosaic: error connecting to WorldImage

I would like to use the ImageMosaic plugin to set up a Geoserver layer which refers to a WorldImage, just like in the official tutorial. As a simple test case, I put a custom folder into my Geoserver ...
0
votes
0answers
390 views

How to fill in the parameters for kernel density estimation?

I am desperately trying to calculate animals home range with kernel. Unfortunately, the result is obviously incorrect and I cannot identify my mistake (I would like to post a screenshot but its not ...
4
votes
2answers
148 views

How to (vertically) register a DEM to GPS readings?

I don't know if what I ask is possible or not but let's try... I have two datasets: a DEM as a point cloud in a relative coordinate system, constructed with 3D algorithm structure-from-motion. 20 ...
3
votes
1answer
80 views

Selecting Cells in a raster layer

I am working on a watershed analysis project. The goal of the project is to create a model that will simulate changes the effect that different land uses will have on the watershed as a whole. Using ...
1
vote
0answers
151 views

Color Ramp of Raster Rendering in MapServer

Does this proposed new syntax work yet? http://mapserver.org/development/rfc/ms-rfc-6.html#proposed-new-syntax Currently, I am still using this method for rendering the raster in Mapfile. STYLE ...
1
vote
2answers
262 views

Some tiff not included on a vrt index

I have some tiff files and I'm trying to generate a vrt index with gdal tool, gdalbuildvrt. I run this command: gdalbuildvrt orto_index.vrt -srcnodata "0 0 0" -vrtnodata "0 0 0" *.tif and throws ...
3
votes
0answers
435 views

Novel ways of filling in missing values in a raster

I am looking for robust ways to fill in missing values in some rasters. They all have a single layer. Missing values consist of single pixels to medium sized patches. Rasters are around 1000 x 1000 ...
1
vote
0answers
176 views

Python Script Producing Empty Cost Path Rasters

I'm trying to run a script that will create cost paths for a large number of randomly generated points then assign the cost to those points. But my script is beginning to create cost path rasters ...
2
votes
1answer
335 views

Black zones after tiling two tiff files

I have two Geotiff files. with one side overlapping. Each Geotiff is surrounded by a black frame. I have created an Image Pyramid with Geoserver 2.3.0 but when I try to see the layer on OpenLayers, ...
1
vote
1answer
149 views

r raster package rasterize failing:no slots

I'm having trouble rasterizing a shapefile using the raster package in R. shp<-shapefile(ZoneShape); lcRas<-raster(lcRaster); r<-raster(ncol=ncol(lcRas), nrow=nrow(lcRas), crs=CRS); ...
2
votes
1answer
234 views

Convert lat/long four corners data to raster

I have a data set in the following format.each row represents the coordinates of the four corners of a cell and the last column is the value associated to the cell. lon1 lat1 lon2 lat2 lon3 lat3 lon4 ...
2
votes
1answer
988 views

Correlation between rasters using R

In R, anyone know a method for measuring correlation between raster and spatialpixels, or between two rasters?. I read something about Kulldorff but do not understand how to use it, and maybe it's not ...
1
vote
1answer
286 views

Layers and variables box does not exist in ArcGIS raster calculator window?

I have a problem with layers and variables box in raster calculator. The layers and variables box does not exist in the raster calculator window! So I cannot add any raster to the expression. I ...
4
votes
1answer
90 views

Why are raster z-values changed when reprojecting?

I have raster data with height values (z). When I try to reproject/warp the raster to Gauss Kruger 3, the z-values are changing (several meters). (The data is already GK3, but I have to reproject ...
2
votes
0answers
65 views

Raster layer with unique vector for each raster cell?

I have been looking around several hours, even days, but couldn't find a clear answer to my question. I am working on a WebGIS tool that interprets local geology. From more than 70 asc-files, I would ...
0
votes
0answers
70 views

ArcGIS API for Silverlight: Retrieve all Data From a Raster layer?

Is it possible to use ArcGIS api for silverlight to get the data in each cell of a raster layer and store them in an array?
2
votes
1answer
777 views

Better way to get raster values for a large number of point features?

I have several projects with tree point features (SpecialStatusSpeciesPoint) that contain up to 2,000,000 records. I am trying to record tree height (Hgt) and base elevation (BaseElev) values, based ...
2
votes
1answer
133 views

How can I confirm the existence of pyramids in QGis?

I have created pyramid layers for my ASTER satellite images (.img) using Gdal Tools "Build Overviews" (Pyramids). The dialog said "Processing completed". I don't have the impression that zooming in or ...
2
votes
1answer
186 views

Lack of Options in Gdal Tool “Build Overviews” QGis

I am using QGis 1.8 and I want to build overviews (pyramids) for satellite imagery using the Gdal Tool. I would like to use the resampling method "cubic convolution", but the option doesn't exist ...