Rasters are regular grids of values, usually stored in an image-like format.
6
votes
0answers
87 views
Automatic detection of breaklines with a DEM
Breaklines are very useful for describing a terrain - for example to build an exact TIN.
My question is, how to extract these breaklines from a given DEM.
I calculated the curvature (vertical) - ...
4
votes
0answers
73 views
Assigning costs to a road network : use raster or vector?
I have a road network in a PostGis database (db_routing). In another database (db_environment), I have some spatial features of the surrounding environment (trees as points and water bodies as ...
4
votes
0answers
189 views
How can I improve my Georeferencing results?
Background This is my second question related to georeferencing naked raster maps in order to re-visualize them on different coordinate systems and in conjunction with other data layers. The previous ...
4
votes
0answers
141 views
How to change field name in raster file?
I´m having a bit of an understanding problem with a DEM TIF file. I have a DEM TIF file which is served with Geoserver. When I click on the layer the WMSGetFeatureInfo gives me the following output:
...
3
votes
0answers
63 views
Weighted Average of several raster “zones”
thanks for the visit!
Suppose I have two rasters, A and B. I want to determine the value of a certain "zone" in raster A by taking the weighted average of several other zones from raster B, that ...
3
votes
0answers
24 views
arcpy adding time to Raster Mosiac Footprint
I am trying to create a raster mosiac for use in animating data over time. The current workflow is:
Create .gdb (arcpy.CreateFileGDB_management)
Create Raster Mosaic ...
3
votes
0answers
75 views
How do I write XML metadata with Python?
Some Python software I have written generates raster files via GDAL. I would like the software to create an XML metadata file for each raster so that I can include details about how the raster was ...
3
votes
0answers
89 views
Can ArcGIS handle missing values to create a contour map?
I am trying to create a contour map for a waterbody. It turns out that in several locations there is no data. I just don't want to use the missing values as zero in ArcGIS because it would create ...
3
votes
0answers
80 views
How does Zonal statistics handle pixels that are on the border of the polygon?
I am using the plugin zonal statistics to calculate the sum of the raster cells within polygons. How does this plugin handle pixels that are on the border of the polygon, are those cell values ...
3
votes
0answers
200 views
How can you convert a Rainfall Isohyet map into Raster so you can determine the precipitation (mm) at any point?
I'm Joanne & I'm a newbie in ArcGIS... I Hope somebody can help me figure this out:
Specifically, I have a rainfall map (Isohyets) measured in mm (precipitation)... I wanted to know a particular ...
3
votes
0answers
111 views
shortest distance between a raster and another raster
i am using arcgis 10.1
i want to calculate the shortest distance between a raster and another raster. i have a bathymetric raster and an underlying fault plane raster. for each bathy raster cell, i ...
3
votes
0answers
58 views
Geoserver Raster layer cropped by polygon?
I've got a Geoserver raster layer which represents a satellite image. I use the Geoserver WMS to display the raster in OpenLayers. I want to display only parts of the raster - those within a certain ...
3
votes
0answers
75 views
Build Raster Attribute Table with GDAL Utilities
Is there a way to build a raster attribute table using one of the GDAL utilities? I know you can view it using gdalinfo and I have successfully created one using Python, but it would be so much ...
3
votes
0answers
77 views
Is there a way to create raster by interpolating point values using GeoTools 8.2?
im new in using GeoTools (8.2). I was able to create shp from asc file which contains my data. Now my question is is there a simple way to create (interpolate) a simple shapefile (only points) to ...
3
votes
0answers
283 views
How to serve OpenStreetMap Tiles locally using ArcGIS Server 10?
We want to serve OpenStreetMap Tiles locally using ArcGis Server 10 to use as base maps in our ESRI Silverlight and Flex GIS clients.
We've downloaded our regions OSM file and created PNGs using ...
3
votes
0answers
95 views
Geoprocessing Service to return Multidimensional Raster from a NetCDF file
I have tried to make this work for weeks with no results. I am trying to create a model in ArcMap that uses the Multidimension Tool "Make NetCDF Raster Layer" and return a raster to which I can apply ...
3
votes
0answers
164 views
GFS SIG/SFC file format of siganl.gdas/sfcanl.gdas analyzing/decoding problem
I am creating a database from datafiles. I encountered many fails and errors, which I have already fixed (also with the help of this Q&A web). Now I am stucked a bit in decoding of 6 files because ...
3
votes
0answers
119 views
How to read pixel values from an image server layer with ArcObjects?
I'm having a problem with reading pixel values from the image server layer. The image server layer class implements IRasterLayer, so when I tried to read pixel values using IRaster2 obtained through ...
3
votes
0answers
155 views
ArcSDE - How to edit mosaic dataset
I have a mosaic dataset (Raster) in an SDE database. As expected, when I click start editing, ArcMap says that I have to do "Register as Versioned" before, but I can't have a mosaic dataset in a ...
3
votes
0answers
158 views
Equipotential Surface Generation Using Monte Carlo Simulation on Large Raster Images
All,
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 ...
2
votes
0answers
34 views
Why is Orthorectify button not active in Image Analysis Windows in ArcGIS10?
I wanted to Ortho rectify GeoEye HR imagery using existing RPC and IFSAR DTM in Image Analysis. According to ArcGIS Resource center ...
2
votes
0answers
53 views
Problem in importing raster data from PostGIS to Geoserver
I am using Opengeo Suite 3.0.2, PostGIS 2.0.3 and PostgreSQl 9.2.
I am trying to import raster data from PostGIS to Geoserver but facing an error.
I follow this tutorial link to import the raster ...
2
votes
0answers
62 views
Raster area (QGIS) problem explained
I would like to know the area that each value in a raster has... The raster I have has values from 2-15 and I would like to know the area that each value is occupaying within my polygon... Thanks!
I ...
2
votes
0answers
56 views
How to create raster attribute table to a raster data using gdal python?
I classified a remote sensing data and saved it as a raster using Gdal python. I want to create a raster attribute table for this classified result.. my classified raster has five classes with ...
2
votes
0answers
61 views
Point file to raster
I have a point file of trees in my study area, which includes the attributes of each tree. Each tree also has a crown radius associated with it. I need to summarize the attributes of these points ...
2
votes
0answers
35 views
Is there a tool for automated quality assurance for vector data captured on raster data?
I wonder whether is any tool(or script) in ArcGIS or QGIS which allows to make an automated quality assurance for vector data captured on raster data?
vector data on binary raster:
2
votes
0answers
25 views
How to change the order of a raster in order to create mosaic with MosaicPro (Erdas 9.2)?
Is there a way to reorder the input files so I can control which ones are on top of the others?
2
votes
0answers
39 views
What are the characteristics of a raster to Netcdf layer in ArcMap?
Specifically, when trying to edit the attribute table? This is would be for work purely in ArcMap, and converting raster to Netcdf. I have a land cover layer (that I've converted to a raster to ...
2
votes
0answers
89 views
How to geocorrect in qgis?
I need to fit a utm wgs84 tiff raster to a topomap in the same projection. I use GCP and it invariably fails. The first raster uncorrected rater superimpose well, the "geocorrected" raster is ...
2
votes
0answers
53 views
Cubist Add-In for ArcMap
I'm looking for an ArcMap add-in that will create a raster based on rules from RuleQuest Research's Cubist .model files. Ideally, the add-in will give the user the option of matching input raster data ...
2
votes
0answers
78 views
Sextante - SAGA- Shape to grid question?
I have a vektor shape (Index 1-5). After using the saga tool (shapes to grid) I'm getting a raster (values 1-5). The problem is that the NO DATA area is defined as 129. Is it possible to set 129 as no ...
2
votes
0answers
117 views
Overlay Shapefile onto Geotiff
I have a Geotiff map and I want to overlay a Shapefile onto it. Ideally I want to specify a 'nice' style for the polygons e.g. have them opaque (for now all polygons should be the same).
I want to ...
2
votes
0answers
258 views
Output raster extents when using the Spatial Analyst Extract By Mask tool to clip a raster
I am using ArcGIS 9.2 and I have a simple python script that does the following :
Loop over a polygon feature class (shown in red in the image
below)
For each record, create a feature layer to ...
2
votes
0answers
148 views
Raster format with rotated cells - no resampling
Is there any way to rotate a raster w/o resampling? I am aware that rasters are always 90 deg perpendicular grids, but is there any file format or methodology that allows for a diagonal raster - one ...
2
votes
0answers
82 views
raster data expressed as percent
I downloaded NDVI greeness data from the USGS Integrated Vegetation Mapping Viewer. In the metadata it says that visual greenness values range from 0 to 100. My data is from the period ending 3/5/12 ...
2
votes
0answers
155 views
Importing Rasters to ArcSDE 9.3.1 using sderaster
OK, I am trying to import a raster to 11g using the sderaster command. It is a stand alone jpg with a world file associated, and pyramids.
Am I right in assuming I cannot import a JPG, I can only ...
2
votes
0answers
90 views
Identifying Rasters in ArcGIS 10 SP4?
I have a raster in ArcGIS 10 SP4 set to bilinear resampling in its display properties. When using the identify tool it returns the resampled value instead of the raw value.
Can we get the identify ...
2
votes
0answers
133 views
How to sort entries in raster legend?
How do I reorder the Value field in a raster? There is no up or down button in it.
2
votes
0answers
218 views
Create custom pixel block size in ArcGIS 10?
I'm using the new IRawBlocks in ArcGIS 10 from the adopted sample in ArcGIS 10 SDK help and I want to create a custom sized pixel block that feeds me a block of values column by column instead of a ...
1
vote
0answers
29 views
Different results from Spatial Analyst GP Tool and Python
I am writing a script that has to subtract one raster from another.
The rasters I have represent
1) Parking Lots (1 = Parking Lot, 0 = not Parking Lot) and
2) a buffer around the Parking Lot (1 = ...
1
vote
0answers
27 views
QGis Grid statistics for polygons error - Module caused access violation!
I'm trying to calculate statistics for a raster layer using an overlaying polygon layer, I'm using SAGA "Grid Statistics for polygons" function, but it returns an error, sadly.. So in the sextante log ...
1
vote
0answers
60 views
How to get Lon/Lat values from the postgis raster type column
I have a tiff raster in my PostGIS 2.0 database. I want to get the value lat/lon and extra data like temperature from the raster type column in postgis table.
I want the table with columns ...
1
vote
0answers
59 views
QGIS: Different projection result for on the fly and transformation
I am a bit confused about the result of a re-projection/transformation of a raster in QGIS 1.8 (Lisboa).
WGS84 to WGS84/UTM34N. When I use the 'on the fly' transformation the resulting raster has a ...
1
vote
0answers
37 views
GetCapabilities Request for WMS
I'm trying to connect to a WebMapServer with the Geotools WMS classes.
My problem is, that the resonse-object "capabilities" doesn't contain all layers.
When I'm doing the request in a browser, I can ...
1
vote
0answers
52 views
Reclassifying a raster based on values in another raster
I am attempting to create a new raster based on the values of two rasters I have already created. I am using ArcGIS 10.1
Raster1 is an area with my true values.
Raster2 was created by reclassifying ...
1
vote
0answers
27 views
Rasterlayer divide
i´m new to qgis at all. I´m a blender user and found that beautiful NZ heightmaps at koordinates.com wich are CC 3.0 and free to use.
I want to use this maps for heightmap displacement if i can ...
1
vote
0answers
58 views
Why Stacking rasters return all values as NAs?
I have several rasters that I want to do some calculations ,basically calculating the moving average.
dir2 <- list.files("D:\\2010+2011", "*.bin", full.names = TRUE)
...
1
vote
0answers
51 views
Join field from table to a raster layer
I'm trying to join a field in a table to a raster layer. I'm using the tool 'Join Field'. The table is in a excel sheet, but have been imported to a file geodatabase. The table has an ObjectID field ...
1
vote
0answers
55 views
Creating Raster with values based on function output
I have a function that calculates a price based on the input slope and distance. I want to write the price to a raster as the rastervalue. How do I do that? OpenSource and ArcMap solutions would work.
...
1
vote
0answers
127 views
Are there any examples of WCS getcoverage requests done using ajax?
I am looking through openlayers to try to figure out a consistent format for generating views of coverages that can satisfy any wcs server, but mainly I'd like to get geoserver coverages.
While I've ...
