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

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67 views

Why do multiple raster processing tools fail with this DEM?

I have a provincial sized DEM. I need to clip it to a fairly large watershed boundary. Should be easy. I've tried: Data Management Tools -> Raster -> Raster Processing -> Clip (Did I make sure ...
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2answers
40 views

How to use a raster dataset to store and retrieve “vectors” using Python?

For a rectangular area of about 10 by 10 km, I have to generate "displacement vectors" with a 1 meter resolution (i.e. a delta-x and delta-y value for every cell of 1 by 1 meter). I will end up with ...
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1answer
533 views

Converting DEM to Floating Point Raster (FLT) using QGIS?

I am looking to convert a .DEM exported from AutoCad to a floating point raster file type (.FLT) utilizing QGIS to implement in HEC-RAS Mapper. This is accomplished easily in Arc using the ...
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28 views

Same CRS but different units of raster cells in qgis

I have two rasters with the same CRS (WGS 84/UTM 34N). One is from a LiDAR scan and the other raster is created thru interpolation of point measurements by me. I would like to change the cell size to ...
0
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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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3answers
6k views

Exporting Selected Raster Graphics using ArcGIS Desktop?

I'm having a problem exporting raster graphics using ArcGIS 10. It seems simple enough, but for some reason I cannot get ArcMap to work with me. Here are my steps: Add a raster to ArcMap Open the ...
2
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1answer
578 views

ERROR 999999: Error executing function - Failed to execute (CopyRaster)

ERROR 999999: Error executing function Unexpected operation No spatial reference exists This is a fragment from my log report: ERROR 999999: Error executing function. Database user ...
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1answer
33 views

Processing time/speed for Mosaic to New Raster

I have a question on speeding up “Mosaic to New Raster” or finding an alternative. After completing a suitability analysis we are trying to define movement corridors. We used a modified CircuitScape ...
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0answers
25 views

Stretch to MinMax results in blank render output in QGIS?

I am a new QGIS user, and I can't figure out if I encountered a bug. If I have a multi-layer image, and "Multiband color" -> "Stretch to MinMax" selected I get the following behaviour. QGIS takes a ...
6
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1answer
360 views

How to store Large Raster Images of Equipotential Surface Generation Using Monte Carlo Simulation?

I have a large (1GB+) raster that I am using as the base for the generation of an equipotential surface. This is to assess the accuracy of DEMs derived from another source. In situ observation is ...
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3answers
31 views

Raster area calculation

I would like to know how to calculate area of raster image based on cell? based on night light data I classified the image and i need to know the area of that particular classified area
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2answers
24 views

Polygon to raster. How to keep same values?

I have a polygon with values 3, 6, 9, 12, 15, 18, 21, 24, 27 an 30. These are the time it takes for the firetruck to reach certain destinations. Now i want to compare these to another raster that have ...
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0answers
19 views

Using numpy.dstack() for merging two 3D arrays but losing spatial reference.

The code is as following: >>> temp = numpy.dstack((spi_negative,spi_positive)) >>> >>> temp.shape (16, 126, 294) >>> out_ras = ...
0
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3answers
43 views

Delivering DEM layers with visualisation?

I'm not sure if it's right place to do that but I am in a strong need of getting some help. I am creating maps with lake bathymetry and there will be a lot of them. My task is to proceed the data ...
2
votes
1answer
45 views

Calculate data from a set of raster files

I need to make some calculations with data from raster files saved in my postgis database. I need, build a map, using the average from a set of these raster files, for example. Besides, I need to ...
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0answers
15 views

Kriging results in log mode and SpatialPointsDataFrame manipulation

I've a little problem, probably because I'm not fully expert with R data manipulation. I've perfomed a kriging elaboration of mydata, in log mode, as the classical meuse example, but how can I export ...
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0answers
31 views

Extracting data of two overlapping rasters

I am trying extract the data of two overlapping set of rasters (one, a stack of 35 rasters, all from the same source and the second an elevation raster) to get a data.frame of the values (mean of the ...
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0answers
23 views

QGIS tiff image loaded but not visible

In QGIS I used the Georeferencer on a jpg image I had prepared in Gimp. But when I load the resulting tiff image into my QGIS project it is invisible, even though an image viewing program can show it ...
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2answers
211 views

Remove sections, defined by a line or polygon, from a raster in QGIS

(QGIS 2.6.0 on Windows.) I have created a raster layer of heights using the TIN interpolate function. I also have another raster layer with more accurate information on the height of particular areas ...
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1answer
20 views

Surfaces and Rasters in DWG format

I have been asked to export a DEM into DWG format, is this possible? The only thing I can think of is to create a regular grid of points and to export this. Also I have been asked to save geotiff ...
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0answers
27 views

Using arcpy.CopyRaster_management function convert raster to 64-bit raster?

I am writing a Python script tool that takes a raster as an input parameter. I want to use this input to create a constant raster that is saved to an output geodatabase (which is another parameter). ...
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1answer
210 views

Creating Dem from cross sections

I have a question I appreciate that if someone can help me I have a DEM in arcmap and cross section of a river which flows on the Dem in Hecras. I now the cross sections are more accurate. I want to ...
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2answers
56 views

How do I cut a donut hole in a raster in QGIS

I have a DEM(1) of a bigger area and a higher resolution DEM(2) in a small part of the same area. I would like to cut a hole in DEM1 and replace it with DEM2. Is there a non python way of cutting a ...
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0answers
14 views

Check if raster (part of) lies within a pixel - python/gdal

I have a list of the corner-coordinates of different grid (c1-c4). First i sorted these coordinates to ensure that c1 is the upper left, c2 is the upper right, c3 is the lower left and c4 is the lower ...
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1answer
17 views

Conditional Combine Rasters and Track which Raster pixel used

I have 6 rasters with pixel values ranging from 0 to 1. I want to extract the highest pixel values from each raster to create a new raster, but also have a way to show which raster the highest value ...
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29 views

Adding value in raster file from attribute table in QGIS?

I have a raster (in tif format) with one band (an ID number). I also have an attribute table with several fields(columns) for each ID number of the raster file. For instance, raster.tif: 1 band (ID) ...
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1answer
42 views

Is it possible to locate a specific marker point on a raster using python and use that location for georeferencing

I have several scans of the same map, which I would like to georeference. I can not use arcpy.WarpFromFile_management(...) as the rasters are slightly different due to scanning. Is there a ...
3
votes
2answers
395 views

Calculating Z-scores using ModelBuilder in ArcGIS Desktop?

I am trying to take the natural log and then calculate z-scores on cell values in several composite band GRID rasters in ArcGIS Desktop. I am not fluent in Python and do not see a way to automate ...
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1answer
23 views

Table Select does not work in Model Builder, when using parameter in SQL

I'm trying to create a model that uses values from a single table, in order to perform a different calculation for each raster in a file. Each raster is represented in the table by a row that contains ...
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0answers
22 views

Add raster layer or a WMS using geotools - problem to run the jar file from cmd

I am using geotools in order to develop a custom GIS. So, i tried to add a raster layer and a WMS based on the tutorials given by geotools. When i am running the project using the main class in ...
3
votes
1answer
41 views

Standardising DEM raster for a MCE

I'm trying to complete a Multi-Criteria Evaluation for an MSc assessment and am in the process of standardising my factor maps. Unfortunately, my DEM layer (ASCII file) keeps changing from this: ...
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4answers
162 views

List of GDAL raster file extensions

I am trying to compile a list of file extensions that are accepted by GDAL, something like ['.tif', '.png', '.jpg', '.jpeg', ...] I found a list of GDAL Raster file formats, but the values in the ...
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11 views

What are the standard ways of querying raster layers for information?

My use case involves loading raster maps as a layer on a base map (built in Mapbox/Leaflet) such as: http://landcover.usgs.gov/global_climatology.php or http://due.esrin.esa.int/page_globcover.php ...
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1answer
1k views

How to create the attribute table for a raster that was produced by the Slope Tool (ArcGIS10)?

I use the Slope Tool (Spatial Analyst Tool – Surface) of ArcGIS10 by ASTER GDEM (that was exported to UTM projection). The program produce new raster (with slope value), but the resulting raster ...
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1answer
40 views

Counting number of pixels/cells with particular value in raster using ArcPy?

I have a raster image containing values ranging from 1 to 10 in Integer format. I want to count the number of pixel with value = 1. Is there any method in Arcpy which returns the pixel count if ...
0
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1answer
46 views

How can I modify the coordinates of a raster in the QGIS?

How can I modify the coordinates of a raster in the QGIS? i.e. longitude and latitude (geographical positions) I need to modify X Min = 144964.482217 X Max = 150226.504610 Y Min = 4398796.699505 Y ...
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44 views

Clipping raster without create new table in PostGIS?

I'm learning about PostGIS, and I would like to create a SQL to cut a raster with a shapefile to work in my R program. I managed creating a new table, but I would like build it without a new table. ...
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1answer
911 views

ArcMap 10.1 - Tabulate Area tool “doubling up” for Overlapping Buffer Zones

This question is related to a previous question I asked: Raster Version of Spatial Join (one to many) I used the Tabulate Area tool to crosstabulate values between an overlapping "buffrast" raster ...
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2answers
70 views

Vector to raster conversion [solved]

I'm using GRASS but, in case, I'm also familiar with R and QGIS. I'm trying to convert a vector area map into a raster one. My problem is that the resolution of the raster is too low (and I can't ...
0
votes
1answer
112 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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votes
1answer
62 views

Buffer from Point or Polygon with Information from Raster

The intent of this work is to define a buffer around a point or polygon based on information from a raster. For instance if a polygon representing a city and the raster defines how long it takes to ...
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0answers
24 views

geoserver load image mosaics tiff files

I have a massive amount of tiff files (+prj. all together 100k). For test purpose I have loaded a small bit of these into geoserver and worked fine. But when I try to add to the store the data folder ...
3
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0answers
45 views

LasDatasetToRaster does nothing to the Raster Layer

I have been trying to figure out how to clip and rasterize a LiDAR map file programmatically (Not through arcpy) I use C# but read many languages. So far I have been able to access and assign the LASD ...
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2answers
45 views

gdal_translate crashes on huge jp2

I have 44GB jp2 file, I want to translate it to tif file, but once it reaches 10% it crashes. No messages, just stopped. This is my command: gdal_translate.exe -of GTiff --config GDAL_CACHMAX 8000 ...
3
votes
1answer
45 views

Polarity of Slope raster for use in Multi Criteria Evalution

I'm looking to use a slope raster in a MCE however i am struggling to ensure it has the correct polarity. The polarity of my other two layers is high values = good and low values = bad. The slope ...
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1answer
80 views

Clipping a raster layer with a shapefile on mac

I am trying to clip a raster layer using the raster clipper function. However, for some reason this is not working for me and I haven't been able to find the answer anywhere. I choose my raster ...
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1answer
224 views

Add Raster To Mosaic Dataset: Could not recommend a data source crawler for the specified input

I'm trying to add rasters (TIFF) to a Mosaic Dataset after adding some rasters, the process fails with the message. ERROR 999999: Error executing function Could not recommend a data source crawler ...
2
votes
1answer
48 views

Round() does not return an integer raster in R

I want to convert the datatype of a raster to integer. For example: x <- raster(nrow=10,ncol=10) its datatype is float dataType(x) [1] "FLT4S" then I round the pixel values of x by y <- ...
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1answer
54 views

how to save a raster after converted from numpy array?

I'm trying to save a raster after calculation in numpy array. Here is what I wrote: rasterSM = arcpy.NumPyArrayToRaster(SM, lowerLeft, cellSize, value_to_nodata=nodata) rasterSM2 = ...
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votes
3answers
2k views

Clipping Vector File based on certain Raster Values using ArcGIS Desktop?

I need to clip a vector file based on certain values of a raster (Slope > 2%). I can´t find a direct way to do it. Trying to vectorize the raster first didn´t work. Is there an ArcGIS tool I could ...