Tagged Questions
2
votes
1answer
87 views
How to calculate volume from a raster file?
I have a raster file containing the depth of water. I need to find the volume of water using that raster file. I need to find the area of each cell and multiply with the depth. How can I do it in ...
3
votes
2answers
65 views
How to calculate the shared area between a raster and a shape file in ArcGIS 10?
I have a raster file with 5 classifications developed from habitat modelling algorithms. I'd like to know how much of 2 classes of the raster is covered by the network of protected areas (Shape file). ...
1
vote
1answer
64 views
Copy and Paste symbology in Raster?
Hi all,
I am trying to figure it out how can I take a preserved color from a raster I already set up before and then apply the colormap to a new raster file?
Here are the details of what occurred:
...
1
vote
2answers
108 views
“Extract by Mask” changing raster pixel values…or not?
I am using ArcMap 10.0 and am confused by my Extract by Mask output rasters.
I hope to eliminate the black background from three Landsat ER Mapper images so that I can mosaic them. Originally I ...
1
vote
1answer
78 views
Where is the File Geodatabase Raster Dataset file stored?
I have a esri file geodatabase with a raster dataset. How can I find out which physical file the dataset is referring to?
(I am retrieving the file geodatabase through the internet. It all seems to ...
7
votes
1answer
189 views
Differences between Raster Dataset, Raster Catalog, and Raster Mosaic
I have about 40 scanned, colorful Geology maps that are GeoTiffs. I want to bring them into an Esri FileGeodatabase to lower their size, combine them as one and display them with a mostly transparent ...
1
vote
1answer
129 views
How to assign new values to a raster attribute table - by comparing two fields?
I have created a new raster from two raster datasets using combine operation in ArcGIS. The new attribute table has two fields from the input rasters. What I need is, to compare these two fields and ...
0
votes
2answers
194 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 ...
5
votes
1answer
258 views
How to calculate the flood volume using a LiDAR DEM and a HEC-RAS floodplain polygon
I’ve got a vexing GIS analysis problem which is
conceptually fairly straightforward, but in reality more challenging to figure out….
Basically, I need to calculate the VOLUME of floodwater within a
...
7
votes
1answer
136 views
Calculating distance from points to different class in raster
I am looking for some advice on how to calculate the distance from a point to a different class of a raster. Specifically, I have observations (points) of animal use overlaid on land cover data. For ...
7
votes
2answers
192 views
How to count and rasterize polygon overlaps in ArcGIS?
How do you take a vector layer with overlapping polygons and turn it into a raster where each cell counts the number of polygons containing that cell? We are looking at polygons of fire burn areas ...
1
vote
2answers
63 views
Getting 2147483647 and -2147483647 as min and max output for point to raster, polygon to raster, and feature to raster tools
No matter which feature to raster tool I use (feature to raster, point to raster, or polygon to raster), I am getting a raster output whose min and max values are 2147483647 and -2147483647, ...
1
vote
2answers
125 views
Why is Format of output data grayed out on Save As dialog for Rectify?
I started georeferencing and I could not save my new "rectify" file, I don't know if is because of the raster or I did something wrong. Then I find out that my control layer is not accurate, it ...
3
votes
1answer
76 views
ArcGIS Raster Symbology - Break contour at 0
In ArcGIS 10, how can I break raster symbology (stretched) at a particular value (i.e. 0). For example, I have a DEM representing both topography and bathymetry and I want a break at the 0 m contour ...
2
votes
1answer
125 views
Saving rasters in a Python for loop fails only on last iteration
I'm a newcomer to Python scripting and I'm having what's seemingly a very simple problem but one that's stumped me enough to send me posting to these forums for the first time.
I'm using a for loop ...
1
vote
0answers
50 views
jagged edges in mosaic DEM
I encounter edge issues when trying to mosaic USGS NED DEMs in ArcGIS 10.0.0. After projection and aggregation, I attempt arcpy.MosaicToNewRaster_management(). I've reproduced the same results using ...
3
votes
1answer
102 views
parallelization of raster mosaic
I would like to create a raster mosaic of the national USGS NED 30m DEM (~50 GB). I'd like to leverage parallel processing using python multiprocessing module where possible. I'm using ArcGIS 10.0. My ...
0
votes
2answers
338 views
Difference between Geostatistical analysis and Spatial analysis tool for interpolation
I did interpolation on point data using "Geostatistical Analyst" tool. It gives me surface layer. Then I exported this layer into raster image (by right click on this layer=>export data into raster) ...
2
votes
1answer
145 views
Question about sizes of input rasters for raster calculation
To calculate any formula (conditional statements/relational operation etc) in the raster calculator in ArcGIS using two different sources of raster images, I'd like to know input rasters must be the ...
8
votes
2answers
354 views
How to reclassify a very large land cover dataset?
Consider the NLCD2001 Land Cover dataset for Alaska (download link). I need to reclassify this dataset so that only pixels of value 41, 42, and 43 are preserved; all other pixel values should become ...
6
votes
1answer
147 views
Calculating “relative slope” per Mora-Vahrson method in ArcGIS
I'm a longtime lurker who finally decided to register on the forum (in no way driven by my need to have a certain question answered, of course...).
I was contacted by a colleague asking for help ...
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 ...
1
vote
1answer
102 views
Trying to run raster calcuatlor to build an expression for ls factor
I am trying to run a raster calcuatlor but it failed. I believe there is a word that ArcGIS 10 does not understand resolution. Maybe there is a word that needs to be interchangable for this ?
I took ...
2
votes
1answer
105 views
How to repair broken Mosaic Dataset data sources?
I have a question. My computer has been replaced with a new Xeon Workstation. Before that, I had a temporary workstation and had ArcGIS 10 on it. While I was waiting for the new workstation to be ...
4
votes
2answers
255 views
Annoying little line in color ramp legends - how do I remove it?
This was never a problem with ArcGIS 9 but it appears that in 10.0 Esri has added small horizontal lines as the default when including color ramps in legends. I want to get rid of these annoying ...
3
votes
1answer
327 views
Creating Isolines from point Data
I'm quite new with ArcGis 10 so I’m having difficulties with something that may be simple to some. Anyway I have a list of bores that I’ve plotted using coordinates. Now I need to draw a single ...
3
votes
2answers
567 views
Extract raster by mask output does not completely overlap the mask
I have a flow accumulation grid and a shapefile containing catchment areas. Now I want to do some calculations on them so I need to extract data from cells in the raster adjacent to certain catchment ...
6
votes
1answer
235 views
Smoothing raster features into polygon
I have raster data representing urbanized areas, which I'd like to trace and convert to a polygon.
Using ArcMap's Raster to Polygon tool, I'm able to get something close to that.
Unsimplified:
...
2
votes
1answer
110 views
joining a table from zonal statistics as table with a layer, problem with reserved names
I have a raster file (percentage of total forest killed) and a shapefile with polygons (municipalities). I thought as a first step I would like to find out which municipality shows the greatest ...
3
votes
1answer
658 views
Polygon to Raster Tool Problem
I am trying to create a raster data set from county level polygon data for the US. I have successfully created one raster from a dataset, but when attempting another, it does not work. I am ...
2
votes
2answers
193 views
How to get easting & northing of cell in raster using ArcPy?
It might be very simple task. But I would appreciate if someone can comment on How I can get easting and northing of a single cell raster using arcpy as this value is used for in further steps. ...
4
votes
2answers
1k views
How do you use GIS to detect percentage of Land Use Change
I am a student in GIS I have a dissertation about land use change. I have questions about using ArcMap 10 for this aim, how can using GIS to detect the percentage of land use change. For example we ...
5
votes
2answers
270 views
How to enclose clustered points with polygon?
I have a raster with forest (1), no forest (2) data. "1" is represent single/few trees and there is gaps between them. I want to create a polygon around these trees to a forest map. It is not a dense ...
0
votes
1answer
176 views
zonal histogram fails to create output table when looping
Using python I'm having problems when trying to attempt a FOR LOOP with the ZonalHistogram function of ArcGIS 10.1. It works fine if I use it only for one image but it gives me this error while for ...
4
votes
1answer
253 views
Export selected raster cells to polygon
I have selected certain values in a raster (roughly 1000 cells), and would like to export them to be able to create a polygon. Converting it to points first then to polygons does not work. Can anyone ...
1
vote
0answers
114 views
Reclassify ESRI raster using variables from a SQL Server table (connecting with pyodbc)
I am trying to reclass a raster file (representing vegetation and land cover types) using values stored in a SQL Server Express table. I have a set of ~400 species records in the table, with each row ...
1
vote
0answers
53 views
Corrupted rasters after import into ArcGIS FGDB
I have been seeing a number of corrupted rasters recently after importing them into file geodatabases (FGDB). The image below left shows a .tif prior to the import, while the image to the right shows ...
1
vote
1answer
562 views
How do I add TIFF files to one layer/raster catalog?
We have several TIFF images (already tagged with position information) we want to load as a single layer into the map. It's the first time I dig into this raster/topology thing, but at least I managed ...
2
votes
2answers
529 views
NoData values recognised in raster in ArcGIS but not following symbology rules
I have a GeoTIFF raster in ArcGIS, which can be downloaded from the following two links:
http://www.rtwilson.com/downloads/MODIS_MOD04_16-06-2006_Subset.tfw
...
2
votes
1answer
278 views
Creating a constant elevation raster with multiple attributes
Is it possible to create a raster with a constant value with multiple attributes? Such as:
rowid value count Name
1 630 36000 Forest
2 630 75000 Anthro
3 630 2600 ...
8
votes
3answers
924 views
Best method to aggregate 1m DEM mosaic to 10m DEM
I have a mosaic of a 1m LiDar derived DEM. I need to output a subset of the data as a 10m DEM. I am currently using the aggregate tool in ARCGIS 10 to produce a mean value for each new 10m pixel. ...
5
votes
1answer
407 views
Raster processing with Python or Arc raster calculator
I have 4-band NAIP imagery that require the following processing steps:
Convert to 8 bit unsigned B/W
Reverse (note not inverse) the image, so that dark values appear
light and light values appear ...
3
votes
2answers
403 views
Image does not display after clipping raster
I am using ArcGIS 10. I am trying to clip an NLCD layer from a vector polygon. I have used the Clip Raster tool in Data Management and Extract by Mask tool in Spatial Analyst among other things. My ...
3
votes
2answers
261 views
How can I apply stretch in ArcGIS 10 Image Analysis Window?
I need to apply stretch to ArcGIS 10.1 exported raster. The best way to accomplish this task: Image Analysis Window, because there are fine tools to equalize raster data.
1 - This is my IRS-P6 24m ...
5
votes
2answers
1k views
Raster mosaic not displaying raster values ArcGIS 10
I have eight DEM tiles that I downloaded from the USGS National Elevation Dataset. The individual rasters are displaying correctly, but when I try to combine them in a Raster Mosaic I get arbitrary ...
1
vote
1answer
131 views
Adding Field to Raster
Good day!
I have a shapefile which contains X-specific field. I want to add this X-specific field (integer) to a raster dataset. I am using ArcGIS 10. How can I do this? Thanks.
5
votes
2answers
921 views
ArcGIS Export Selected Raster Graphics
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 ...
16
votes
3answers
801 views
Packing Polygons within polygon
I have a Boolean raster.
In the grey areas of the raster I would like to fit a given size polygon within a contiguous extent.
Basically, I have an irregular polygon, and i would like to "fit" a ...
3
votes
1answer
564 views
ArcGIS 10 trouble displaying raster correctly
I think I've come across a Bug in ArcMap 10 in displaying rasters. This particular model comes from the USGS GAP Species dataset with metadata hosted here. I'd like to know if anyone else has ...
10
votes
7answers
2k views
How do I create a shapefile showing footprints of Rasters?
I have around 1,000 satellite images in tiff format, and I want to create a shapefile which will serve as an index to the rasters. This is something similar to a raster catalog, but I do not want to ...
