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

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R -plot 12 images per plot or save 12 images per image file in R

Here is R script and my question is How can I plot 12 images per plot or save 12 images per image file because I have total 864 images. RAD1998 <- raster(paste(getwd(), "/1998bil ...
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177 views

Multiply point values by raster values

I have a point shapefile containing elevation values in the id field. The shapefile is overlaying a raster layer of the topographical slope. Is it possible to multiply the elevation value of each ...
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690 views

How to remove black box around georeferenced grayscale image in QGIS?

i'am trying to georeference a grayscale image (*.tif) in QGIS 2.2.0 Valmeria. It is working but QGIS draws a black box around the georeferenced raster image. If i use the option set 0 transparent, not ...
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4answers
491 views

Best tutorials on raster data formats and raster manipulation [closed]

I am looking to improve my understanding of raster formats and how to manipulate them. I don´t really want to go into the mathematics of it, but really want to know the differences between the ...
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101 views

Is it possible to alter raster values without Arcpy? [closed]

I'd like to be able to alter raster values, through fairly simple equations, without using the module Arcpy. Is that possible? It seems like gdal, numpy, and rasterlang might make this possible but ...
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315 views

What causes ERROR 000732 from MosaicToNewRaster?

I'm trying to run the MosaicToNewRaster tool as part of a python script. This is my code: input_rasters = arcpy.GetParameterAsText(5), arcpy.GetParameterAsText(6), arcpy.GetParameterAsText(7), ...
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913 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 ...
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4k views

OpenLayers (allOverlays): Vector layer not rendered without raster layer beneath it

This is another newbie question. I'm trying to create a map using OpenLayers that comprises only of vector layers from a WFS server. However, I'm thwarted because my vector layer won't render unless ...
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How to Clip a Shapefile of Circle features using a Raster using ArcGIS 10

I want to keep all the features in the shapefile that lie in the raster region and reject others. How do i do this? ------Adding More Details-------- Data to be Clipped: Is A Shapefile of 1 mile ...
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47 views

Raster Image Importation

I am trying to open a raster image file in Arcmap 10.3 . I have the AUX File, a JGW file , 2 XML Document files ,and a RRD file. It imports into Arcmap 9. However, Arcmap 10.3 does not import the ...
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68 views

How to rasterize a vector dataset in R?

I would like to compare vector vs raster data. So i try to fix a problem using both ways. I made it in vector first : coastline<-readShapeSpatial("shp") wets<-readShapeSpatial("shp") ...
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115 views

How to clip several raster datasets with a mask?

I would like to clip many images (raster datasets, input) with a mask (shapefile), so I would concentrate only in the images I need for my study area. Is it possible to do with Arc GIS 10,3 ? I ...
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530 views

Counting number of Raster Cells satisfying a criteria within a Polygon

I have a USA raster dataset, which assigns to each cell a value from 0-100. I also happen to have a USA county shapefile. I simply want a count of the number of pixels/cells in the raster data with ...
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2answers
323 views

After turning census block data into a raster, how do I redistribute the density to reflect land cover types

I plan on rasterizing (terminology?) census block data relating to density to a regular 30 m by 30 m grid for use with NLCD data. I then hope to distribute the density of the original census block ...
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131 views

Re-sample raster to acre grid using ArcGIS Desktop or R?

I have a 1m classified landcover raster layer that consists of values 1-4 representing various land covers. I need to resample this layer to an acre grid. Each acre in the resultant grid should ...
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2answers
52 views

Splitting Raster in ArcGIS

I have a 30m raster dataset for the continental US, and would like to divide it into manageable chunks to convert it to vector, etc. What's the best way to accomplish this? I don't want any overlap ...
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1answer
575 views

I don't find the mistake in my RandomForest-classification

I am trying to make a RF-classification of aerial-imagery to specify tree-species. I extracted 3 bands and made a .csv file with columns: band1 band2 band3 x y class The band columns include ...
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551 views

Converting raster layer to polygon form using ArcMap?

I am trying to convert a raster layer of U.S. climatic regions into polygon format using ArcMap 9.3 under Windows XP. The original data are to be found at the following address: Koppen Climate ...
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408 views

How to convert raster negetive pixel value to positive

I was working on ground water Level. I used raster math minus function and the Output raster grid data contains negetive cell values. ma resulting raster contains values ranges from High : 0,187477 ...
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904 views

Calculating percentiles of a raster (TRMM DATA)

I have a set of raster (floating point) i.e A daily rainfall intensity data for a year, now i need to select and group these raster in to various percentile categories, Above 90th percentile, 50-90, ...
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53 views

Raster To Ascii cmd-line tool

Where can I find a tool like ArcGis: Raster_to_ASCII Provided that the tool MUST be accessible through command line interface.
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117 views

How to get information about only one data point?

I have a vector-point shapefile. The data are not dense (about 1 x 1 degree). Lets say that every point includes value of average wind speed. I would like to create a interactive web-map so that ...
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46 views

Is rid=2 significant in PostGIS raster structure?

It seems that in most, if not all, examples with raster appear to include the WHERE rid=2 statement in the query. http://postgis.net/docs/RT_ST_Value.html Is there something about the rast structure ...
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746 views

Error in raster displays of NoData cells when “zoomed in” past scale 1:3,000,000

I looked around GIS stack exchange and ArcGIS Help pages and didn't find anything on this issue. I have encountered an error in how Arc displays a Raster file (.TIF format) at different scales. At ...
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1k views

Batch merge large numbers of.asc grid files

I have >2.5k .asc grid files which I need to merge into a single overarching dataset. I would like to avoid having to convert them into esri grids first so was looking to use QGIS (v.2.0). I am ...
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162 views

How to force deletion of corrupt ArcSDE Raster?

ArcSDE 9.3 / ArcGIS Server 10.0 / ArcCatalog Advanced 10.0 After an unsuccessful attempt at creating a mosiac, ArcCatalog refuses to allow deletion of the corrupt Raster file. The Mosiac creation ...
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627 views

Equivalence of EPSG:3857 for MapInfo 9.5

I have a raster projected on EPSG:3857 with QGIS. I have image registration in Mapinfo but there is no projection for EPSG:3857. Do you know the projection that I need to use?
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2answers
728 views

Clipping polygon layer into multiple polygons via model builder?

I have a huge polygon layer created from a raster, and over that I have a watershed shapefile. I need to run a land-use regression process on each individual watershed so I'd like to clip and export ...
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1answer
517 views

How to batch merge rasters using FOSSGIS tools?

I'm working with QGIS 1.8 (gdal 1.9.2) and GRASS 6.4.3...but on Windows 7. I "just" want to merge my raster. I've got a folder with 50 GTiff raster from Lidar data. The aim is to merge raster ...
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1answer
156 views

How to make a new raster out of two other rasters [duplicate]

I have two raster images, one is the Corine Land Cover for the year 2000 and another one which is the anthropogenic effect on land. The first image reclassified in 9 categories: Artificial surfaces ...
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1k views

Field added to raster data is not visible in attribute table

I am new to raster data and my background is software engineering so this might be a trivial question for GIS specialists. Some raster files have attribute table but some do not. On those with ...
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2k views

how to convert grid from Saga gis to have raster in Arcgis?

i am new in Saga Gis, i created grid- LS factor (from Rusle equation for erosis) in Saga gis and now i need to "put" it to Arcgis. How can i do this? I tried a lot of possibilities and none of them ...
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1k views

Digitizing from OpenLayers Plugin in QGIS, or create raster?

Is there an easy method for digitizing from a layer added from the OpenLayers pluggin. As i cannot snap to it or use it as raster so the entire map does not load? two separate issues there.
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430 views

Why does only one of three elevation rasters display correctly?

I downloaded a selected sub-set of the USGS National Elevation Data (NED) using their online GUI. This download came in the form of three files. The names of the files are 61471006, 61471006_2, and ...
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1answer
497 views

raster in TOC to geotiff on disk in ArcPy

I am really hoping that someone out there who knows a bit about ArcPy in ArcGIS10 can help me out. I am attempting to automate some work w/ netcdf files. Basically, I am able to automate the creation ...
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1answer
39 views

Reprojecting and retiling a large set of tiles

I am trying to understand the process to re-project and re-tile a set of raster (GeoTiff) but can't wrap my head around how to use the different GDAL tools to achieve my goal. More concretely, I ...
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26 views

Defining the correct AEA proj4string for FEWSnet Rainfall Data (Southern Africa) in R [closed]

I have some general questions about how to go about solving this problem: I am trying to incorporate FEWSnet's monthly Rainfall Estimate data from 2014-2015 for Southern Africa into an analysis where ...
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1answer
34 views

compare three rasters and three conditions with overlay in r

I'm trying to run an overlay function with rasters where I want to meet all of 3 different conditions at each cell and produce a single raster as output. Running ifelse with the & operator ...
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1answer
23 views

output raster size in zonal statistics [closed]

Using zonal statistics, my input raster is 1*1 and input value raster is 10*10. I was hoping the output raster will be 1*1 but it is 10*10. What is the error here ?
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31 views

Extracting raster values to polyline feature

I have a line overlaying a raster containing slope values. I would like to use the line to extract the slope values, and return to its attribute table an attribute containing percentage of slopes ...
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2answers
41 views

Count the number of raster tiles in each polygon in ArcGIS

I have a raster from the TRMM 3B43 product that contains a grid of 0.25 x 0.25 tiles (in degrees). I also have a shapefile with a number of districts. I want to know how many raster tiles are included ...
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66 views

Extracting features from raster data using ArcGIS Desktop?

I want to extract flood related pixels from my imagery. I calculated mLSWI(Modified Land Surface Water Index). According to the literatures, mLSWI >= 0.5 is flood pixels. How do I identify the ...
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1answer
32 views

Get CostDistance IGeoDataset as raster in C# ArcObjects

I have a CostDistanceCode that works correctly. I cannot cast the IGeoDataset result into a raster. The last line returns a null raster. How can I resolve this? // Declare the output ...
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1answer
48 views

Transfering raster attributes to a shapefile

I am using Arc GIS 10.2. I have a raster layer and a shapefile layer. I would like to transfer the attributes of the raster layer to the shapefile layer using a majority rule. The raster layer is a ...
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46 views

R: Convert Extent Object to Shapefile

I want to convert R 'library:raster' 'extent' object to a shapefile. I have the CRS available too. e= c(4304916, 4305325, 365216, 365439)#xmin, xmax, ymin, ymax proj4string(e) = CRS("+proj=utm ...
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140 views

Using Loop for calculating NDVI

I am using MOD09Q1 now and I would like to calculating NDVI whole year data. One year, I have 46 band 1 images and 46 band 2 images. list.files I creating list of band 1 and list of band 2. ...
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81 views

Pictures with no background or transparent in ArcGIS layout

I would like to add a .jpg, .png or .tiff with a no background. In other words, I want the logo to appear as it was created, without a border or background, to my Layout view. Also is it possible ...
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1answer
60 views

Creating polygonal windows for spatial analysis in r

I am attempting to normalize a spatial point pattern using a population density raster in r. My problem is that the function I am trying to run is recognizing the "white space" around the raster I am ...
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2answers
109 views

PostGIS polygon clip inaccurate using ST_Clip and ST_Union from tiled raster

I have a RGB raster tiled at 128x128 in PostGIS enabled database. I am trying to clip from the raster using a polygon as follows: SELECT ST_AsGDALRaster(rast,'GTiff') FROM ( ...
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1answer
29 views

PostGIS - Raster - update all values - what is prefered

I have added the Raster support to my PostGIS database program. Now, I need to update all values in the raster (one band only) several times a day. I have found and tested these two options Use ...