raster conversion for GIS work

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3
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2answers
79 views

how to change the pixel value to zero when it corresponds to a slope above 15%

i have a landuse raster data and raster data containing slopes in percentage. i want to assign pixel value as zero which corresponds to slope more than 15%. i tried using 'extract by mask' but i'm ...
3
votes
2answers
77 views

Create a raster map from more than one shape

I've some shapefile loaded in Arcmap (steets, buildings...) with an appropriate symbology ad I need to convert them to unique raster, to obtain a map (like topographic map) with a specified resolution ...
2
votes
2answers
2k views

How to convert .geotiff --> .tiff?

How to convert .geotiff files to .tiff files (ordinary plain images)? Basically, I have cropped the image to a rectangle of interest and knowing its left-lower location and having chosen the pixel ...
2
votes
2answers
223 views

Looking for Tools for writing ECRG

Does anyone know of consumer-level tools that can write Enhanced Compressed Raster Graphics (ECRG - MIL-PRF-32283) files, based on some other raster format (e.g. GeoTIFF, or some image plus world ...
2
votes
1answer
85 views

Convert SpatialGridDataFrame in to polygon shapefile in R

I have a SpatialGridDataFrame in R and want to plot just one of its attributes as as polygons in a GIS. There seems to be no simple way to do this. The situation is complicated by the fact that the ...
2
votes
2answers
103 views

How to adjust raster size for usage in raster calculator?

I want to make a visibility analysis of planned wind turbines in my region. I have a DEM raster and a polygon describing the possible area where the wind turbines might be set up. People are ...
2
votes
1answer
88 views

How to preserve original resolution of scanned 1-bit PDF raster with gdal_translate?

I am using gdal_translate to convert non-spatial PDFs to non-spatial TIFFs (intended for subsequent manual georeferencing). This is my gdal_translate command: gdal_translate -of GTiff -sds -co ...
2
votes
1answer
159 views

Create base maps from vector data

I may be trying to attack this problem incorrectly, so I'm sure I'll be corrected. I currently have quite a few shapefiles containing all of the major highways, streets, railroads, counties, etc. of ...
2
votes
1answer
79 views

Revert back from RGBA raster to original 1 band raster cell value

I have a number or single band raster grids that have been converted to RGBA (png). I no longer have access to the orignal single band raster data but have the png files. Is there a way to convert the ...
2
votes
0answers
18 views

Choosing the map scale (1:nnn) for the given raster dimension

Starting points: let define the raster image size, say: 1800x900 pixels I want draw my own raster image map - by drawing polygons e.g. like "draw line from pixel with coordinates x100y100 to pixel ...
2
votes
2answers
51 views

Create a raster from file geodatabase featureclass based on a field from a related table

I have a USDA Statsgo soil polygon featureclass stored in a file geodatabase along with an attribute table; I have a one-to-one relationship class defined based on the soil type field. When I bring ...
2
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0answers
62 views

Hwo do I present labels in raster format in ArcMap 9.3?

I'm creating a raster map of a large city in ArcMap 9.3 which will be used in a third party software. My problem is that I need to find a way to include labels of street names in my output. I have a ...
1
vote
1answer
51 views

Why doesn't ArcGIS rasterize every polygon

I am trying to rasterize elements from a vector map but somehow ArcGIS only lets me rasterize 15 objects. I added a new field so that every object would get the same value. The original layer had 87 ...
1
vote
2answers
77 views

Select individual lines from feature class, convert to unique rasters: “raise e” error?

I have a feature class with 5 lines in it, and need select each one and turn them into its own raster -- for example, line 1 is raster 1, line 2 is raster 2, etc. This is the python script: import ...
1
vote
1answer
668 views

Spatially join large raster to polygon shapefile

I have a large raster file with elevation data. From this raster, I would like to infer the average ruggedness for different geographic zones (like countries). I have the "countries shapefile" as a ...
1
vote
1answer
37 views

Appropriate pixel size when converting vector to raster

I am converting vector polygons into raster datasets. Is there a standard calculation for converting the scale of the vector into an appropriate pixel size (e.g. 25 metres)? My vector has been ...
1
vote
1answer
83 views

How can I flatten a multi-band raster to a single-band raster in ArcMap 10.2?

I need to convert a multi-band PNG image into a single-band raster, for analysis and visualisation. How can I do this in ArcGIS 10.2?
1
vote
1answer
234 views

How can I convert ERDAS img file into headerless binary file

I have trouble to convert ERDAS .img file into headerless binary file. I want to use those images in TIMESAT program. I'm trying to do this in IDRISI 32. But there is an error saying "minimum values ...
1
vote
1answer
74 views

Convert point to grid: Numbers of cells differ

In R I am trying to aggregate points data to a grid. The data for the grid (G-Econ) comes as a csv-file. In this file each row represent a grid-cell at 1x1 degree resolution and the given ...
1
vote
1answer
137 views

Raster to polygon conversion's raster field takes only “Value”

Recently I am working with raster data and arcobjects.net. Here I find something new for me. And here some question arises in my mind. I tried to search some document that can satisfy my mind, but I ...
1
vote
2answers
82 views

Unsuccessfully trying to iteratively run gdal_polygonize in a batch file [closed]

Thanks in advance for your help with this. I've been reading, experimenting, and banging my head against the wall for a couple days on this, and could really use some assistance. This is my first ...
1
vote
1answer
216 views

How can i convert a raster from continuous to discrete?

I have a tiff that is 'invalid' for a lot of tools and will not let me view the attribute table. I think this is because it is "continuous" rather than "discrete". Does anybody know how to convert it ...
1
vote
2answers
61 views

How can i combine the colours of one raster with values from another

I have two Tiffs with data from the same area. One is in colour and when I use the identify shows a 'color index' number (eg. 141), then Color(a,r,g,b)(eg. 255,90,255,0). The other tiff contains a ...
1
vote
2answers
84 views

Conversion of raster to polygon

Using C# and ArcObjects, what is the recommended way to convert a raster file into a polygon. I need this for calling the Near tool so that I can move a station which may be inland to the nearest ...
1
vote
1answer
119 views

If I convert a TIN to a raster in ArcGIS will results from the two versions of the surface be comparable?

I have converted a TIN to a raster. I found that the top of a bund wall shifts laterally in position between the TIN and the raster into which it has been converted using the TIN to raster tool in ...
1
vote
1answer
206 views

How to use the “Iterate Rasters” tool in ModelBuilder to link “Raster to Other Format (multiple)” tool to the “Extract by attributes” tool in ArcGIS?

I wish to link the "Raster to Other Format (multiple)" tool to the "Extract by atttributes" tool. The "Raster to Other Format (multiple)" tool only allows you to specify an output workspace, but the ...
1
vote
1answer
339 views

Failed to convert polygon to raster

I have two steps here. First select layer by attributes. Second convert polygon to raster. It failed when it goes to second step and kept giving me error 999999: Error executing function. I pasted my ...
1
vote
1answer
27 views

Raster domain output polygon has is an empty feature class. Shape_Length and Shape_Area = 0

I am trying to convert a 32-bit floating point raster with 205289 columns and 120615 rows to a polygon using Raster Domain. It creates a feature class that does not contain any polygon. There is a ...
1
vote
0answers
42 views

Big data rastering using ArcGIS Platform?

I have the daunting task doing raster analysis on a record set that runs into quite a few millions, and worse still is that the data is in Hive. So far I have managed to use record set of 2 million ...
1
vote
1answer
85 views

QGIS 2.2 Raster Merge losing color data

I'm trying to merge a couple of GeoTiff maps using Raster > Miscellaneous > Merge but the merge is only coming out in grayscale. The geotifs are using palettes color. How do I get the merge to keep ...
1
vote
1answer
51 views

QGis points distance from shore in metres

I have a grid of depth points in the Irish Sea that i'm trying to add other data fields to, in this case distance from shore. I've tried both of these suggestions to no avail, but am having some ...
1
vote
1answer
98 views

GeoTools 10 - Convert Raster To Vector

I am fairly green with GeoTools, and having a hard time converting a raster (GridCoverage2D) into a vector format. In the hours I've spent searching this site and Google, there seems to be multiple ...
1
vote
0answers
226 views

QGis Save Raster as Rendered Image

In QGIS 1.9.0 Master, when you right click on a raster in the Layers Panel and select "Save As", you can select the output mode to be "Raw Data" or "Renedered Image". When selecting the Rendered ...
1
vote
2answers
567 views

Polygon to raster conversion failure - workaround for very small polygons?

As one of many processes within a workflow/script, I need to convert polygons to rasters. I am using the feature_to_raster tool in ArcGIS 10.1. This is done within a python script, but for the ...
0
votes
2answers
175 views

ArcGIS: Export GRID to TIFF keeping its (classified) symbology

I want to export an esri grid-raster into a *.tiff without losing the symbology I created for the grid (the symbology is classified). No matter how I try to solve it I get a stretched symbology in ...
0
votes
2answers
141 views

Can QGIS2 / GDAL convert to .ECW without corruption?

I have qgis 2.0.1 and it can read *.ecw files that I download. However, when I convert say a *.jpg or *.tiff to *.ecw the output is corrupt. Has anyone seen this problem?
0
votes
2answers
103 views

Conversion of diagonally adjacent pixels into one polygon?

I am trying to vectorize a raster whose digital numbers indicate different classes they belong to. ArcGIS and QGIS yield similar results: separate shapes out of pixels sharing the class that are ...
0
votes
2answers
99 views

Low resolution raster conversions to vector yielding millions of single pixel polygons. Trying to merge all directly adjacent polygons

I'm trying to scan plain pdf maps containing color-coded geographic regions and convert them into undifferentiated (I don't actually need them to contain any attribute data) overlays. My workflow is ...
0
votes
1answer
147 views

value field name after raster to polygon conversion

When I perform Raster to polygon conversion using tool, sometimes it creates a field named "GRIDCODE", sometimes the field name is "grid_code". Why does it create random name of a field?
0
votes
1answer
39 views

Converting Raster datasets into layers using ArcPy/ModelBuilder?

I am new to ArcGIS and ArcPy (just started using them on Wednesday). I am using a model to create a Point Density plot from a Shape File, with the output being a Raster dataset. I want to ...
0
votes
2answers
82 views

Reading a raster map cells values in C#?

Suppose I have a raster map file (TIFF, TGA, JNG... etc) loaded with geo-info manifested by the cells values. I need to read the values of the raster map cells "programatically" in a C# program. P.S: ...
0
votes
2answers
64 views

How to reduce Polygon to Raster (Conversion) bit depth?

I have a polygon featureclass that I am trying to convert to raster format at a low bit depth (i.e. <8 bit unsigned). The FC contains 50,000 polygons which have five values: 1,3,5,7,9. I have set ...
0
votes
1answer
170 views

How to specify field name in raster to feature conversion tool or intersect tool?

What I want to do : input: raster file, polygon feature layer process: Convert raster to polygon using IConversionOp.RasterDataToPolygonFeatureData Method Intersect resultant polygon feature class ...
0
votes
0answers
11 views

Extra Column after Using Polyline to Raster

Does anyone know why there is an extra column in the resulting raster file (Raster2) after using the tool Polyline to Raster in ArcMap 10.2? I had imported the cell size and set the extent to be the ...
0
votes
0answers
30 views

How to choose which band is used to calculate DN when converting a raster to vector?

I currently have a raster layer of flood water levels (elevation) which I need to convert to a shapefile for future use. My raster is 4 bands: RGB + one band with values from 0 to 10, representing 10 ...
0
votes
0answers
18 views

Shape file generation [duplicate]

Is it possible to generate a shape file with lines and polygons using only the image for which it has to be generated ? I need the lines,polygons feautres of the shape file in an algorithm which i am ...
0
votes
0answers
27 views

Long Time for conversion raster file to vector in QGIS

I'm a new user of QGIS, and I'm tring to convert a .tif file in a vector. To do that I have used the "Raster conversion" option, but it's taking long time. I'm waiting for the conversion since 20 ...
0
votes
0answers
55 views

How to open a raw binary raster in QGIS or R

I have a raw binary raster without a file ending, and no header file. I would like to open this in either QGIS or R and then convert to geotiff, but opening it seems to be a challenge. Here is a ...
0
votes
1answer
48 views

I'm converting a raster to TIN and a large section of it didn't convert properly (ArcGIS 10)

I've got a DEM for a pretty large area and I need to create a TIN. I'm using 3D Analyst Tools > Conversion > Raster to TIN. The process runs without any error messages, but a large section of the TIN ...
0
votes
0answers
52 views

select by attributes in modelbuilder while using iterate?

I have crated a model that iterates GPX-files from a folder and works through it and gives me a raster as output with pixel values after how many tracks passes through each pixel. This works the way ...