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

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61 views

Publish postgis raster based on column value in geoserver

I have a postgis raster table with the following columns: rid, rast, year, plant I created a wms layer in geoserver pointing to the table and successfully serve out the raster when the table only has ...
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386 views

Convert Raster to Numpy Array with only Arcpy and Numpy

All the articles I'm finding including GDAL or PIL(?) which I cannot use. So I am trying to convert a raster I have to a Numpy Array with Arcpy and Numpy and then calculate some statistics on it but ...
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18 views

Combining unique raster value using QGIS?

I am writing an instruction to combine two unique raster values using an open GIS software packages like QGIS. Example of two unique raster values are raster1=landcover, raster2=admin units. The ...
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53 views

Why Does My Raster Catalog Crashes When I Try to Zoom?

I have a file geodatabase which includes a Raster Catalog. Up until today I've had no problems with my Raster Catalog. Now, when I pull in the Raster Catalog, I can see the footprint of my rasters. ...
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59 views

Pan sharpening of World View 2 image

I want to pan sharp world view 2 multispectral data its panchromatic band using HCS resolution merge tool in erdas imagine, can any one guide about which resampling technique(Nearest neighbour, ...
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137 views

Converting raster image of floor plan

I'm looking for ways to convert a raster image of a floor plan to workable data in a sense that the program should be able to locate the destination by referring to the co-ordinates of matching ...
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162 views

stack raster using GDAL and numpy dstack

I am testing Savitzky-Golay filter with my MODIS dataset. Currently I am testing for 10 rasters (but later on will use my whole dataset) only just to test how should I create my script. So my initial ...
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117 views

How to make DEM raster in Google Sketchup?

I would like to make DEM in google sketchup, later add 3D buildings and finally convert this file to raster. Afterwards, I want to import this raster to GRASS GIS to make solar maps. It is possible to ...
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27 views

Common methods of area comparison?

I have a set of raster area results, that represent a prediction for a specific loccation. I would like to measure accuracy of two methods, given the actual values, estimate-A method values and ...
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28 views

How to select a subset of rasters layers among thousands using QGIS?

I have thousands of rasters each one represents presence or absence of one species (0 absence and 1 presence). Some of them are completely absent in the landscape which I am working on. In other ...
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55 views

Stream to Feature, creating continuous streams

I have derived a stream network form a DEM through flowdirection and flowaccumulation in Arc 10.2 Hydrology toolbox. Have grids of stream order and stream link. Need to convert stream order grid, ...
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38 views

how to add vectorlayer in a mapcanvas with a raster

I am working in c++/qt4.8.5 with qgis api 2.8.2 For my application I had to load a raster in a mapcanvas, then with different action I had to add pint , line or polygon Is there a simply way to do ...
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40 views

Opening .dir ASCII files

I'm working on some ecological models and one of the datasets I'd love to utilize is that of ECOCLIMAP, its files consist of a hdr metadata file and a dir ASCII file, which I believe is built for the ...
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25 views

Raster ordination

I have 4 raster layers from one Landsat image. One is NDVI and others are layers which shows different soil units (Sabin's color composite). My NDVI shows different class of vegetation (grassland, ...
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48 views

why ENVI displays colormap classified image as a RGB image

I want to do accuracy assessment in ENVI. My ground through image has 19 classes (Unsigned 16bit) when I opened it ERDAS and ARCGIS. But when I opened it in ENVI, ENVI displays these image as a RGB ...
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33 views

Derive individual land cover classes from .jpg map

I have a .jpg image which is land cover classification image with 9 classes. I want to extract raster image (.img file) which contains the same classes as .jpg image (9 classes too). Is there any tool ...
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40 views

reproject satellite orbit values from irregular grid to regular grid

I have a ncdf file containing measurements covering a satellite orbit. The ncdf contains the corresponding latitude / longitude fields but they ar irregularly spaced. I tried rasterizing the values ...
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45 views

Referencing a raster by center coordinate

I'm concerned with producing mosaics from UAV thermal IR video frames. I exported several several frames containing the temperature values in a matrix (.csv). From camera specifications and flight ...
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51 views

QGIS display wrong histogram statistics for float32 raster

While trying to display a float32 raster created with TauDEM, QGIS displays a min/max of 1,1 although the .aux.xml file contains the correct values. I am using QGIS 2.10.1 both on Windows 7 and Mac OS ...
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38 views

multiple attributes in csv file to raster

I have a several large comma separated text files each with multiple attributes. Each text file is about ~2.9 GB with 21 million lines. Each line contains X, Y, VALUE1, VALUE2, VALUE3, etc. The X and ...
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43 views

Achieving consistent RGB Composite Settings using ArcPy?

Does anyone know if there is an arcpy tool so that when I bring in raster imagery (Specifically Landsat) into ArcMap it will automatically adjust the settings of the RGB composite? I know under ...
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64 views

How to find details to NASA's "Earth’s city lights” images

I am currently working with these images. To find the resolution etc. is simple. But how to find in what units are pixel values? Or any additional details for "how to cite" these images?
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75 views

Project Raster: Resampling

Is this (optional) resampling technique in the Project Raster tool only being used if changing the grid resolution (cell size)? Or should I always select bilinear (or cubic) for continuous data even ...
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44 views

comparing raster values over one specific transect

I have a raster with water temperature data. I used various kinds of filters over it (smoothing, sharpening filter etc.) in various combination. I want to compare the results, to check which ...
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87 views

Is there a “1-band color raster color table” plugin substitute for QGIS 2.10?

I'm currently using QGIS 2.10 and I'm having some difficulties with creating color tables for raster files. I've been looking for the 1-band color raster color table plugin or something similar but ...
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104 views

Georeferencing google earth historical images

I have been trying to raster and georeferenced an historical set of images from Google Earth but I am experiencing issues after done the first one properly. I save 4 images from Google Earth of the ...
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66 views

raster data and polyline shapefile do not line up

I am working on an ArcMap .mxd encompassing the state of new mexico. I have a shapefile of the state boundary with the following coordinate system GCS_North_American_1983 WKID: 4269 Authority: EPSG ...
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22 views

Raster math with iterator (arcpy)

I know what I am trying to do here is wrong. But I was hoping for something similar that would do the job. Basically, I need a placeholder for values and raster calculations until I sum them ...
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39 views

How can I work out the percentage of different raster parcels in a polygon

I have a raster layer (LCM2007) that contains 24 classes of landcover and a shapefile, polygon, which represents areas in a survey. I want the area, or percentage, of each class in each area. For ...
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223 views

Merge raster layers error

Is there an issue with the SAGA-tool "Mosaicking rasters"? I tried it with different rasters. In Sage itself it works fine. Algorithmus Mosaick raster layers startet... io_gdal 0 -TRANSFORM ...
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74 views

How to view a raster from a 10.2 Mosaic Dataset in ArcMap using the “Lock to specified rasters” method?

I am attempting to use ArcMap to view a raster from a mosaic dataset (contained within a file geodatabase) without much luck (see Viewing one or more rasters within the mosaic dataset) Steps: Use ...
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138 views

Can I use .aux, .sid, .sid.xml, .sid.aux.xml, or .sdw files as raster in QGIS?

I am working with data from my boss who uses ArcGIS. I am aware that .aux files accompany raster files, but to my knowledge you can still use .aux files to create rasters in ArcGIS. I'm working with ...
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47 views

How to build a raster populated with an equation in a python toolbox?

I am working on creating a python toolbox to solve for WiFi signal properties based on various inputs, and for the end result I would like to have the output in the form of a raster. I need this ...
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45 views

Spatial segregation from a raster of racial distribution in the USA

I am trying to measure the degree of racial segregation at some geographic level (let's say the county level, for simplicity) in the USA. I have a shapefile with these geographic units. To do so, ...
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124 views

Aggregate / Calculate Cell Statistics >1000 Rasters

I'm looking for a tool/script that does simply what "Cell Statistics - Mean/Sum" in ArcGIS does but for more than 1000 Rasters (TIF) (I need to process ~10000 Raster at once). I'm not used to use ...
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64 views

Reclass by Table giving output with only 8 catergories

I am attempting to reclass a raster from a table (using the Reclass by Table tool in Arc 10.3). The output value field I am trying to reclassify to is long integer format with values ranging from 0 ...
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34 views

What is the recommended approach to client side clipping, by geometry, of an ArcGISImageServiceLayer?

I have an existing Esri Silverlight application with an ArcGISImageServiceLayer and we need to add the ability to clip that raster, by a geometry. And ideally, do this on the client side since the end ...
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156 views

Combining tiff with shapefile

I have a geotiff image with a D_WGS_1984 Datum of land cover for the continental US and I want to be able to merge it with a US counties shapefile. What is the fasters and best way to do this? My ...
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59 views

Raster map source for desktop, commercial application

We develop desktop, commercial application for Architects (c++). In a future update, we would like to provide our customers with the option to automatically create a 3D terrain with appropriate ...
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87 views

Problem with calculating slope in QGIS

Ive downloaded DEM form earthexplorer. But after calculating slope I only have blac img. with same value in min. and max. When calculating aspect or relief, DEM works correctly. Have you met with ...
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80 views

Converting a (WAsP) vector map to a raster map with GRASS GIS

i'm quite new to GIS and i need to convert roughness data which is available in a vector format to a raster format. The final data should be on a simple 2-dimensional uniform grid with a constant grid ...
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30 views

“Mosaic to new Raster” just stop working

I have been using the command "Mosaic to new raster" so far successfully. Now, without changing any option from before, it just doesn't work anymore. It is something it already did: pretending to ...
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47 views

Raster NoData Issue

I have three landCover maps (2000,2006 and 2012),I am using ArcGIS 10.1, I converted them into raster (from polygon to raster 100x100 cell size), I guess because it is remote sensing maps (obtained ...
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44 views

Calculating maximum mean temperature of the coldest month with a lists of rasters

I need calculate the maximum mean temperature of the coldest month. I need first select the coldest month in a list and then in this month determine the maximum temperature. I do this: Create the ...
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30 views

fail to convert polygon to raster

I have a shapefile with 520 districts each with a value. I am trying to convert this shapefile to raster using feature to raster tool. Input feature: myshapefile Field: value Output raster: ...
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43 views

Maxent does not create the distribution map

I've been using Maxent to run a model, the program produces multiple output files except the html file, the map pictures and the distribution map or raster file (.asc). Does anyone know why this could ...
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95 views

NDVI from raster to vector isnt working

I have question...can I make from raster img. vector file via qgis? Because Ive tried it on NDVI image and Ive only got one file with atribut table full of #null. Image is from landsat7... ...
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48 views

Obtaining NDVI data from selected area

I need to analyse NDVI (-1/1) change between years (05-10y). But still only under selected shapefile. To analyse the extent of each NDVI category. Any tips? I have tried to make vector from the NDVI ...
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21 views

Raster alignment terminology?

I identify two types of raster alignment (assuming SRS is the same), but I am unsure of the correct terminology for these (or whether there is even a 'standard')? First, there is 'pixel alignment'; ...
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28 views

Dynamic polygons grid with specified area based on raster

I'm interested if anyone have idea how to automatically create (maybe in R?) dynamic grid of polygons with specified approx. area (for example around 20000 m2) based raster data or points with values ...