Questions tagged [orthophoto]

An aerial photograph geometrically corrected and adjusted for topographic relief, lens distortion, and camera tilt - such that the scale is uniform.

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Weird issue in orthophoto of canpy in rough terrain

After postprocessing drone imagery of a forest area in rough terrain, I had a weird issue such as in the images below. The effect is like the cropping of trees following the DSM. If you have ...
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Crop a satellite image RPC

I am trying to ortho-rectifiy a single satellite image, and the issue is that the image is too large (Covers a large portion of a city). Is there a way to crop the image along with it the RPC ...
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Open-source tool that is equivalent to Compute Control Points in ArcGIS Pro

I was wondering if there are any plugins or open-source tools that are equivalent to the Compute Control Points tool in ArcGIS Pro. It is essentially used to create the control points between the ...
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Coordinate Operations Error for NAD83(2011) Alaska Zone 1

I am receiving the following error below when running gdalwarp to crop an input orthomosaic in the NAD83(2011)-Alaska Zone 1 CRS. The command still runs and the output cropped TIFF file renders fine ...
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gdalwarp on County-wide mosaic or COG takes forever or seems to hang

I am creating Cloud Optimized GeoTIFFs using gdal from a folder of TIFF files in GDAL for an entire county. After creating a mosaic of these files (in EPSG:6551) using gdalbuildvrt I can create a COG ...
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Using ERDAS Imagine 2020 orthophotos

I am dealing with how to figure it out how to export an orthomosaic from my Agisoft Metashape because when I did the merge chunks there. When you merge there, it doesn't provide what I need because of ...
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How to speed up the rendering time to display drone-derived orthophoto in QGIS

I have a 4cm resolution drone-derived image GeoTIFF that I am displaying in QGIS. The image is approx 600mb, I have a compressed version (BIGTIFF=YES, TILED=YES) approx 250mb. Both when loaded into ...
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Measure an angle on an orthophoto or on a dense cloud

I'm currently working on QGIS 3..10.1, and I would to analyse my roof with UAV analysis. I have already made a dense cloud, an orthophoto and a DEM on agisoft metashape but now I would make few ...
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Converting a drone orthophoto saved as KMZ to TIFF in QGIS

Dragging a drone-obtained orthomosaic image saved as a KMZ file (167mb) into QGIS results in the image being very poor resolution. But when KMZ file is loaded into Google Earth, it's very high ...
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119 views

How can I have the ground sampling distance from the images?

I have some aerial images and I need to know how if I can have the ground sampling distance value from the image without calculate it from the plane fly's parameters.
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Area measurement validation: ellipsoid vs geoid

I try to validate area measurements on orthomosaics using objects of known size on the ground. I'm working on centimeter level measurements. As far as i understand an orthomosaic in WGS 84 is ...
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Adding ortophoto to map through hyperlink in ArcMap

I would like to add layers (more specifically Orthophotos) through the hyperlink function in ArcMap 10.3. With hyperlinks it is possible to add script (VBscript), documents and URL. If I add the ...
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Why does a single NAIP 2015 tile have both leaf-off and leaf-on conditions?

Image acquired at https://earthexplorer.usgs.gov/ with the following criteria: Within tile border of leaf-off to leaf-on conditions:
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Calculating exterior and interior orientation of any drone without camera calibration

I have a drone, how can I find the projection matrix without calibration? Since the drone has a GPS, I know some angles and the distance between the two photos in meters. I also know the formula of ...
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Adding ortho images in Java project ArcGIS (SDK ArcGIS)

I would like to use my orthophoto in my project. I'm using ArcGIS SDK Java and the component: ArcGISMap map = new ArcGISMap(Basemap.createStreetsVector()); My orthophoto size is 4 GB (.7z)
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Automatically georeference non-intersecting UAS photos based on contained EXIF metadata

I need to know how to automatically create georeferenced rasters from multiple non-intersecting photos taken by UAS DJI Phantom 4 Pro. All EXIF metadata is present in every photo - coordinates, ...
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Why do RGB values seem very high for my multispectral orthomosaic imagery?

I am using ArcGIS Pro (2.4.2) to analyze a 5-band multispectral image captured with a Matrice 200 (UAV). All image processing has been done with Agisoft Metashape, which includes calibrating spectral ...
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DSM results from WebODM are not correct [closed]

I am new to WebODM and I am trying to generate DSM and Orthomosaic images using default settings in WebODM. The Orthomosaic image is correct by providing GCP but the DSM file is having inaccurate ...
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Combining orthophoto and DEM to export xyz-CSV

I have a georeferenced orthophoto and a DEM as tiff-file. For my further workflow I want to export x,y,z (x,y from the orthophoto and z from the DEM). I already managed to create a point layer and ...
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-1 votes
1 answer
174 views

Rendering 3D images from 2+ imagesets + DEM in QGIS

The most general way of rendering a 3D model in QGIS is by using QGIS2threejs. It works by adding a single layer raster-image/orthophoto and exaggerating a DEM, usually a 1 band raster. Depending on ...
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Orthorectifying or Georeferencing aerial photographs

I got 3 aerial photographs from a mountainous area (~3500 - 4000 m.a.s.l), from 1956, 1965, 1977 (no metadata, no camera parameters, scanned white and black). My study catchment is relatively small (1 ...
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Sources for Free High-Resolution (4m or below) Orthophotography (Aerial Photography) [closed]

Does anyone know of reliable sites that provide high resolution Orthophotography for The USA? I am not looking for Satellite Imagery. This is limited to Aerial Photography (Orthophotography) or Ortho ...
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Splitting GeoTIFFs

I have three different GeoTIFF orthophotos I am trying to tile (the editing program I use can't accept the GeoTIFFs as is), and I would like to retain the geographical information. Can someone offer ...
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Co-registering multiple temporal orthomosaics?

I have multiple (19) orthomosaics of the same approximate region taken regularly over the course of a couple months with a UAV. Some, but not all, include ground control points we placed in the scene....
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How to import orthomosiac from metashape into QGIS and preserve ortho appearance?

The beautiful image that you see is an orthomosaic [apparently this is not a yet a tag on this forum] generated in Agisoft Metashape [also not a yet a tag] with imagery captured with drone mounted ...
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Rotating ortho-satellite imagery so that square polygon perpendicular to the viewer

I'm trying to figure out how to rotate this satellite geotiff so that the rooftop polygon would appear as square as possible to the viewer rather than a diamond shape. See example below. How to ...
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277 views

Orthorectification with R

How can I orthorectify an oblique image of a flat landscape when I know the conditions of the photo (coords, height, direction, lens, etc)? I would like to perform this kind of stuff from GRASS ...
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Rotating orthophoto based on polygon boundary (rotated pixel)?

When I clip an orthophoto using a vector polygon, the resulting pixels orientation is north-up like as shown in the graphic below. I used Global Mapper, ERDAS, Arcmap "Clip" "Extract by Mask", "...
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How to retrieve GIS data in Multiple Orthophoto at point level

I have been using a python script that can read Data from Orthophoto(*.tiff) of size 300Mb-2Gb. But this is taking 32s per request of lat-long, which is not ok. I have different Orthophotos with ...
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Grass Gis: What is the meaning of a TARGET LOCATION?

I am attempting to follow a guide on creating ortho-photos in Grass GIS, available here: https://grassbook.org/extra/sample-chapter/ The chapter suggests that a separate cartesian LOCATION should be ...
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Where can I find decent resolution (5m ish) night time orthophotography/satellite imagery data for Ireland?

Anything I've found so far has been incredibly granular. I need a resolution which is fine enough to see general lighting footprints for motorway junctions.
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213 views

Orthophoto land use classification in QGIS

I am using a CIR orthophoto and tried to make a land use classification with the use of Semi-Automatic Classification Plugin in QGIS. I work in QGIS 3.2 but I get errors that my ROI are too small (...
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128 views

Coloration of orthophoto different between QGIS and ArcGIS

I have an orthophoto created with Agisoft Photoscan that I would like to use for a map. Why is there a difference in coloration between QGIS and ArcGIS? For the record, the color showing in QGIS is ...
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Combining multiple mosaics into single one using ArcMap?

I collected 615 images with Phantom 4dji. My computer couldn't process all of them together on Agisoft Photoscan, so I separated my photos by area, making five orthophotos. My goal is to combine all ...
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2 votes
4 answers
863 views

Hosting 100 GB of MrSID files in GeoServer

I've been given 100 GB worth of MrSID files (about 2,300) and been asked to create one map with them that can be hosted in GeoServer. I originally attempted to put all of these tiles into a layer in ...
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Scale bars moving after update cause measurement issues

I'm trying to create orthomosaics with accurate measurements of rocks in a stream bed. All the photos were taken from a fixed height and scale bars were added by knowing the dimensions of GCP's along ...
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Trying to deal with pure whites, and transparency of orthomosaic in MapInfo

I'm hoping to deal with this using the raster calculator in QGIS. But, here's my issue (and I'm a pretty novice GIS user); when you bring a raster image into MI, it turns all the null ("no data") ...
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QGIS displays orthophoto distorted

See photos. Both are screenshots of the same geotiff (orthophoto) image. Standard Windows (and other viewers) display the image correctly. QGIS shows the same image distorted. The image is from ...
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Orthophoto processed with Photoscan distorted in QGis

I processed an orthophotomosaic via Photoscan using geotagged images in EPSG 4326 and it is displayed correctly in Photoscan and GoogleEarth. When I put it in QGis it is distorted. The coordinate ...
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Light normalization of Orthophotos to increase comparability

I would like to work with the RGB-values of different orthophotos. Now I noticed that the light conditions are not the same in the different orthophotos. I was wondering if there is a sound way to ...
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Removing all pixels at apprx. ground level in orthomosaic? [closed]

At the moment I am processing an orthomosaic from a plantation and I would like to remove all pixels at ground level to just keep the plants captured on the image. I would prefer to be using QGIS. ...
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1 vote
1 answer
112 views

Downloading map from ArcGIS Server?

I want to download orthoimagery from this link: https://geolibrary-maine.opendata.arcgis.com/datasets/595cf522a36b4c6593acc7a8d5db3190 But when i click download button, the result is; How can i ...
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1 vote
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134 views

Method in QGIS to classify veg from HiRes geotiffs created in Pix4D?

I have 10 2D geoTIFF orthophotos (~2GB each, ~3km2 each, all 4.2cm/pixel) that I generated from Vis RGB 12MP images in Pix4D for a desert vegetation survey over 30km2 for a development. I need to ...
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1 vote
1 answer
552 views

Determining acceptable RMSE for Orthorectification?

I have been reading about orthorectification and did some training on it but my question still remain unclear is how much RMSE should I aim to ? I will be working on a lot of aerial photos that ...
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-2 votes
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Finding total area and percentage of specific color band value from Orthomosaic?

I want to get statistics for a color band within an orthomosaic. Specifically I want to know what area or percentage area of the raster is above a particular value.i.e. band 2 > 60. I'd like to know ...
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1 answer
812 views

Photomosaic non-georefferenced images using open-source software

I have a directory of images that were captured by drone. The images have GPS info in the EXIF tags but are not georefferenced and do not have world files. I would like to merge these photos into a ...
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6 votes
1 answer
6k views

Tile names & coordinates relationship

I'm aware that this site is intended for cartographers, geographers and GIS professionals. I must admit that I'm absolute beginner in the area of maps, but not in the area of programming (40+). I hope ...
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Make images/PDFs in QGIS from Vector Layers [closed]

I have a bunch of vector layers and a few polygons that I want to use to create a image out of while having my image in the background of an aerial photo. I am unsure what commands to use to ...
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DroneDeploy generated Ortho shows skewed in QGIS (projections OK?)

I've recently bought a drone and have been having a lot of fun enhancing maps with very detailed orthomosaics. The images place correctly once loaded in QGis, absolute positioning is good enough for ...
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Define characteristics (wave lengths, etc) of bands created by split order in Orfeo Toolbox

I have an orthophoto layer (exported from photoscan, drone images) that consist of four bands. I extracted bands using "split image" order, but I can't understand which of them are NIR, green, red ...
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