Questions tagged [image-pyramids]
In raster datasets, a reduced resolution layer that copies the original data in decreasing levels of resolution to enhance performance.
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12 views
Using overviews of individual bands of a virtual raster
If I create a virtual multi-band raster (using gdalbuildvrt -separate to combine three layers into an RGB colour image) and each of the separate bands already has its own .ovr external overview, do I ...
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1answer
31 views
QGIS: where is the bilinear resampling option when saving to a new raster?
At 3.16.1, I am saving a raster using Export > Save As. I would like to build pyramids for the output geotiff raster with bilinear resampling. However, bilinear is not an option (see screenshot ...
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13 views
What is wrong with DTM tiles in ArcMap?
I have downloaded Scotland 50cm (phase 3) DTMs for a location I am studying using Digimap. I don't know what has happened to the tiles. When I added them from ArcCatalog I had to select create ...
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1answer
73 views
out of memory error: Java heap space
I have installed GeoServer 2.5.5 on Win 7. When I try to view a raster pyramid I see this message:
OutOfMemoryError : Java heap space.
I google it, but it wasn't useful because I don't use Tomcat ...
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0answers
33 views
Google Earth Engine unequal histogram values
I am creating histograms in Earth Engine of pixel values of cloud masked EVI from different years using Landsat 8. For each of the layers I create, I use an identical geometry to clip the output, but ...
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70 views
Understanding what levels to use in gdaladdo
I am trying to understand how tiles overviews and levels interact using GDAL so i know how to use it appropriate and optimize my rasters to use either in QGIS and/or geoserver.
So just to verify my ...
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22 views
Publish imagepyramid on GeoServer SRS “unknown”
I want to publish an ImagePyramid created by GDAL.
gdal_retile.bat -v -r bilinear -levels 4 -ps 2048 2048 -s_srs "+proj=utm +zone=32 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs" -...
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42 views
How do I extract data about the curve of a coast line from a satellite image using Google Earth Image?
I'm trying to use GEE to analyse the shape and curvature of ocean coast lines from satellite images. What I've been doing so far is: isolating an image from GEE, saving it as a png or jpg, and ...
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35 views
Merging two pyramid tile sets (directory)?
I was searching on the Internet about the merging of GeoTIFF tiles (pyramid tiles) generated by gdal2tiles.
Below are the steps I performed
Downloaded tif-files.
Converted tif to vrt (below command)
...
0
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1answer
94 views
Decimated and windowed read in rasterio
In my workflow using rasterio, I'd like to read an overview from a raster and get only a portion of it through a window at the same time.
Is this possible?
I have a pretty complex script so far and ...
3
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1answer
121 views
Need an alternative to modify overviews in a GDAL Virtual Raster (VRT)
I have built a VRT mosaic and overviews with these lines of code:
out_vrt = os.path.join('/out/dir/', 'out.vrt')
ds = gdal.BuildVRT(out_vrt, my_raster_list)
ds = None
ds = gdal.Open(out_vrt)
factors =...
2
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1answer
48 views
Combining overviews for a large multiband raster image?
I have several large rasters, complete with overviews. I have combined these as separate bands of a multiband virtual raster. However, QGIS performs very slow viewing this vrt. Is there a fast way to ...
1
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1answer
97 views
BuildOverviews() not supported for VRT dataset
I am trying to build overviews in a VRT dataset with python GDAL.
I try this code:
out_vrt = os.path.join(out_dir, 'mosaic.vrt')
ds = gdal.BuildVRT(out_vrt, [raster1.tif, raster2.tif])
factors = [...
1
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1answer
46 views
gdal_retile projection system not defined properly in GeoTIF metadata
I struggle to create a ImagePyramid using gdal to be used in geoserver. Geoserver does not recognize the native proj system.
I have been playing around a lot but I am not sure where the source of the ...
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0answers
208 views
GeoServer Image Mosaic JDBC
I'm running GeoServer 2.15.2 on Ubuntu 18.04.3 with the latest ubuntugis-unstable release packages (GDAL 3.0.2, PostGIS 3.0.0) and cannot get the Image Mosaic *.jar to load. I followed the ...
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0answers
19 views
Is there a way to independantly hillshade the overviews of a GeoTIFF pyramid in GDAL?
Is there a way to get gdaladdo, gdaldem or another GDAL tool to create a hillshade where each overview is shaded from the corresponding overview in the DEM rather than by resampling a single full ...
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1answer
175 views
Serving large (1.7Tb) dataset of aerial images with GeoServer
I have a large dataset of aerial images consisting of 8000 TIFFs where single images are no larger than 0.5G and all have have .ovr pyramid files with them.
Previously I have served this dataset as ...
4
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1answer
175 views
Should I build pyramids/overviews for the source files or for the virtual raster?
I have a virtual raster comprised of a lot of raster tiles of high-res aerial imagery. I wish to build pyramids/overviews to speed up the rendering in QGIS.
Should I build them for the source files ...
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0answers
131 views
Implementing Pyramid plugin in GeoServer [closed]
I am trying to use the Pyramid plugin for viewing the raster tiles in the WMS service. I have done exactly same as its given in documentation URL
Except while converting my TIFF image I have not used ...
4
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1answer
141 views
What kind of resampling will give the highest quality when building pyramids?
The resampling setting of the pyramids builder of QGis povides several ways to do so : nearest, average, gauss, cubic, average_mp, average_magphase and mode. I am not a specialist in the subject. I ...
2
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1answer
569 views
How to force QGIS 3.6.1 create raster's pyramids (overviews) when I drag&drop them in QGIS?
There is a build-overviews-pyramids tool to create pyramids but I want to create them automatically when I add (drag & drop) raster layer into QGIS interface.
I have found parameters that is ...
1
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1answer
61 views
Create pyramid from 3in TIFFs
I have a couple of terabytes of 3in GeoTIFFs that I would like to host on my GeoServer (used by a non profit during disasters when there is no Internet). I have read that the best way to host these ...
5
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1answer
364 views
RGB TIFF goes black when zoomed out in QGIS?
Am importing a RGB TIFF into QGIS 3.4 and when I zoom in I can see the image properly, however, when I zoom out the layer turns black (most of it) and red (a small portion). After doing some search I ...
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0answers
218 views
Creating tiled pyramidal TIFF from PNG tiles that are organized in slippy map?
I have map tiles (Z/X/Y) of a certain location which I serve via a simple web server and add on QGIS for offline usage via the XYZ Tile Layer from the Browse menu.
These are to be used in a survey of ...
2
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0answers
271 views
Why is Raster Calculator not honoring compression environment settings?
For some reason, the Raster Calculator isn't honoring any Raster Storage environments that I have set. Mainly, compression and pyramids. I am processing a large raster dataset through raster ...
2
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0answers
78 views
Indexing derivative tiles / pyramids?
I don't have any formal education in GIS so I'm thinking that I'm looking for something that exists, I just don't know what it's called.
I basically have a large raster data set that will get re-...
3
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0answers
219 views
Geowebcache pre-seed creates white and black tiles
I have published Arial photo on GeoServer using ImagePyramid technique. I have created custom gridset for it.
I have created cached tiles using geoWebcache pre-seeding. When I am accessing it in Qgis ...
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0answers
68 views
Why will my raster only display at certain extents?
I have a large raster image which contains the florida keys and has 1 meter by 1 meter resolution. When I change the extent and zoom in from 1:6,000 and closer, the image is displayed. When I change ...
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293 views
Building pyramids of virtual raster not permanent when file is moved
I have a folder saved under:
C:\QGIS\Active Layers\
In the "Active Layers" folder there our two folders; one called "Geotiffs" and the other "Virtual Raster".
In QGIS 2.18.20 I created a virtual ...
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0answers
214 views
White line appears between the tiles using ImageMosaic / ImagePyramid technique on GeoServer
I have created image Pyramid of 4 levels using gdal retile and published it on GeoServer using ImagePyramid technique. When I am accessing it in QGIS, it seems to work fine but at the zoom level from ...
2
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1answer
739 views
QGIS: building pyramids faster in properties compared to gdaladdo
Does anybody know why building pyramids in QGIS using the "build pyramids" button from the properties menu (tab: pyramids) is a lot faster than command line gdaladdo or Raster->Misc->Build Overviews?
...
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0answers
200 views
Image Pyramid Geoserver Nullpointer Exception
Currently I am facing a problem with our WMS Service on Geoserver. The data source is a big Image Pyramid with 5 levels covering Germany in EPSG:25832. For tiles outside the boundaries of the dataset ...
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148 views
Geoserver imagepyramid and Postgresql for granules
I'm running Geoserver 2.11.2 on Java 1.8.0_144 32 bits on Amazon Linux together with Tomcat 9. The plugins I have installed are imagemosaic, imagepyramid, GeowebCache (internal) and Geofence.
When ...
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1answer
235 views
Generalising Rasters using .ovr pyramid data?
I have to produce some lower spatial resolution rasters from a large number of very big geotiffs (c.800GB).
It occured to me that since I've produced the pyramid overviews using GDAL already I could ...
4
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1answer
1k views
Does building a raster pyramid have benefits even if rasters only displayed zoomed in?
Standard advice about handling large raster datasets on QGIS (and elsewhere?) usually suggests building a raster pyramid. If I understand correctly this process creates reduced resolution (i.e. ...
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0answers
285 views
Geoserver error during loading pyramid iamges
I've add geoserver plugin ImagePyramid and generate tiles by Maperitive. Next I try add this tiles into Geoserver as datasource, but when I click publish after loading I've got this error :
org....
2
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2answers
956 views
How can I pass geotransform to gdalwarp to handle ungeoreferenced image as georeferenced
I'm trying to read ROIs from Landsat-8 overview using GDAL /vsicurl/ , but the image is ungeoreferenced. I have geotransform from full size image, which I can copy. Is there a way to pass geotransform ...
3
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0answers
585 views
Remove near black borders on Landsat 8 overview images
I want to eliminate near black pixels around edges of Landsat-8 overview. I'm interested in doing it not for the entire image but some extent, so I clipped it. I tried using GDAL nearblack utility, ...
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1answer
2k views
How to find out Actual coordinate(pixel values) of chunk relative to the actual image?
I have an image of let say 500 X 500 px, I created tiles/chunks of size (10, 10). Now I want to find out actual chunk coordinate relative to the Original 500X500 px image.
Ex
I have first chunk of ...
2
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0answers
13k views
Zero-size array to reduction operation maximum which has no identity
Below is my identify background code, which identifies a background from an image and removes it.;
Previously it's was working fine but after I chunked my images and try to find out background I got ...
23
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3answers
6k views
How are GeoTIFF pyramids/overviews standardised?
While pyramids/overviews are not part of the GeoTIFF standard, many tools support creating them. For example vips/nip2, Orfeo Toolbox (otb) and ossim which all promise some support for creating those. ...
2
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1answer
914 views
Make Image Pyramid from JP2 Raster
I have ~1.7 GB JP2 Buckeye that I want to serve out from Geoserver; I'd like to have it tiled so that the client won't have to redraw everytime they zoom into the map. My current understanding is that ...
2
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0answers
93 views
Image pyramid with transparent pixels
I have a GeoTiff image which I wan't to use to build tile pyramid and serve it via geoserver. In most cases it works well but fails to publish a layer if tiled images have NO_DATA (transparent) pixels....
2
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0answers
43 views
Disk access characteristics of accessing vs building an image pyramid.
Hosting an extremely large (10-100x ram size) image pyramid via WMS has disk access characteristics closer to a random read, but generating the pyramid is a CPU bound sequential operation right?
4
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2answers
924 views
How to create multiple external overviews for a geotiff with gdal?
I want to have mutiple overview files (one for each overview level) for a GeoTiff, so I'm able to edit this files in a raster editor. How can this be done?
Unfortunately, gdaladdo -ro creates only ...
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0answers
46 views
Can I have two distinct workspaces with two different layers reference the same data store in Geoserver?
Using geoserver 2.7.2 on Ubuntu 14.04 64 bit.
I have a large image pyramid I'd like to use in two workspaces simultaneously. Do I have to create two separate "stacks" of folders, stores, and layers?...
0
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0answers
64 views
Accessing Geoserver plugins through the REST API
I am writing Python scripts to automate the creation of Geoserver layers. For this the gsconfig module has been invaluable, but I often need to execute operations that are handled by plugins, most ...
4
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0answers
593 views
gdal_retile.py leaving gaps in mosaic
I'm trying to create a seamless mosaic from the FAA's VFR aeronautical charts using gdal_retile.py. The end goal is to serve the mosaic using the ImagePyramid extension in GeoServer. However, I'm ...
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0answers
51 views
Loss of Quality in UAV Imagery after building pyramids in ArcMap?
I am using arcgis 10.1 to plot and print maps with a background with UAV imagery. When I insert an image (Tiff format), it loses quality.
The program prompts me to create pyramids, once this is ...
6
votes
1answer
4k views
Comparing use of GDAL to build raster pyramids or overviews versus ArcMap?
I have a large set of imagery that I created a mosaic from in ArcMap 10.1. I want to use GDAL to create the overviews because arcmap has issues building the pyramids and never seems to complete. I ...
