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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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GDAL - From jp2 image with rpc file to Orthophoto geotiff and keep the image rotation

We are trying to convert a jp2 image with rpc to orthoPhoto geo tiff. We do the following process. The problem is that in the ortho.tiff file the image don't preserve it's rotation angle from the jp2 ...
Zlex's user avatar
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1 answer
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Calculating NDVI using OrfeoToolbox

Platform: Windows 11 Aim trying to achieve: I have downloaded some multispectral test data from OpenDroneMap (ODM) forum. The data is captured with DJI Mavic 3M. What I want is to analyze NDVI, NDRE, ...
DevM's user avatar
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-3 votes
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Which band is which in an RGB image

I have several RGB images of which I made an orthomosaic image. I would like to create a VARI vegetation indice. QGIS shows 4 bands in the raster calculator. Which band is which of the RGB bands? One ...
Gábor Zvara's user avatar
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61 views

QGIS Webmap Layers Missing

So I am trying to create a webmap in QGIS with the qgis2web plugin that shows an Ortho (saved as GeoTIFF) created from an airplane overlaid on background satellite imagery. I tried using Leaflet ...
Ian Moffit's user avatar
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1 answer
854 views

Converting Orthomosaic TIF Image to COG (Cloud-Optimized Geo-TIFF) [closed]

I have successfully generated an orthomosaic TIF image from a road survey consisting of approximately 1200 images. These images are all located along a single line, reflecting the nature of a road ...
Dhanraj Jain's user avatar
0 votes
1 answer
491 views

Alternative to Metashape software [closed]

So I am from USA and our government decided to ban using any software products that is from Russia, can anyone from here suggest an alternative software with Agisoft Metashape? Yeah I am upset about ...
PROBERT's user avatar
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1 vote
1 answer
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In QGIS can I make an index grid vector dataset for a folder of orthophot extents?

I have a folder of orthophotos and I need to make a lookup grid for all the photos showing the extent of coverage for each photo in the folder. I want the attribute in the grid to have the filename (...
forestGIS's user avatar
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1 answer
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Exporting JPEG from WebODM takes ages [closed]

I have a largeish (~1000 images) orthomap which was created correctly in WebOSM. When I try to export it as a JPEG (or anything else), nothing seems to happen. The computer is working very hard (GPU ...
user221260's user avatar
0 votes
1 answer
301 views

All layer in QField-project are greyed out and not visible

I wanted to create a QField project with orthophotos from different years to digitise a how a river basin changed due to erosion. However, when I load the project in QField onto my iPad it only shows ...
geog's user avatar
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Incorrect NDVI range results in ArcMap

I am creating NDVI from multispectral orthoimagery for multiple years. For the majority of the data, results from NDVI using the Image Analysis window range between -1 and 1 as expected. However for ...
justin bowers's user avatar
1 vote
1 answer
60 views

Determine Lat/Long of "off-center" point of a top-down image

I am a computer science student with a top down photo taken by a drone. This drone has relatively low to zero gimble yaw/pitch (0-10deg), isn't very high up (~15m) in flat lands pretty close to sea ...
slightly drifting's user avatar
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109 views

Georeferencer producing unusable results

Using QGIS 3.26.1 Buenos Aires. I am georeferencing orthophotos produced with an RTK drone and Reality Capture software. These are typically a few centimetres out of alignment with one another. ...
RobbieLobster's user avatar
4 votes
2 answers
7k views

How to determine the date of the Bing imagery for an area in 2022?

There was this question for 2012 (ten years ago!), but all the answers seem outdated and not working anymore: How to determine the date of the Bing imagery for an area? Is there any way to find the ...
erik's user avatar
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2 votes
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123 views

Using Mosaic + Orthophotos to create Mosaic produce overlap error?

I am using Mosaic + Orthophotos from the package from Datem Software. I have 7 photos that I need to generate Mosaic from Orthophotos . I am not very familiar with this software and just learn how to ...
PROBERT's user avatar
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369 views

Pointcloud to RGB raster (orthomosaic)

I am trying to create an orthomosaic for as cheap as possible. The project I am working on has absolutely no budget and the methods I use need to be easily used by someone who has no experience in GIS/...
Machiel's user avatar
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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 ...
geogeek's user avatar
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1 vote
1 answer
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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 ...
Flurry187's user avatar
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889 views

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 ...
Malcolm's user avatar
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1 vote
0 answers
204 views

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 ...
PROBERT's user avatar
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4 votes
1 answer
594 views

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 ...
Jasper Mowatt's user avatar
2 votes
1 answer
172 views

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 ...
Antonin's user avatar
  • 39
-1 votes
1 answer
602 views

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 ...
Jasper Mowatt's user avatar
1 vote
2 answers
998 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.
Jolly-culture97's user avatar
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39 views

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 ...
Max J's user avatar
  • 141
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0 answers
109 views

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 ...
Amanda Jeppsson's user avatar
0 votes
1 answer
44 views

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:
Lucas's user avatar
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0 answers
87 views

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 ...
lekofer's user avatar
-3 votes
1 answer
81 views

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)
programmation1994's user avatar
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413 views

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, ...
Vladimir Sviridov's user avatar
2 votes
1 answer
171 views

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 ...
ihb's user avatar
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1 vote
0 answers
401 views

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 ...
Shubham Tiwari's user avatar
1 vote
0 answers
134 views

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 ...
sunflower's user avatar
-1 votes
1 answer
398 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 ...
MichaelR's user avatar
  • 562
2 votes
1 answer
1k views

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 ...
Marlon Calispa's user avatar
0 votes
2 answers
651 views

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 ...
Rhodri_22's user avatar
  • 360
0 votes
0 answers
222 views

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 ...
Gregory Hanna's user avatar
1 vote
0 answers
76 views

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....
Alexander Shenkin's user avatar
2 votes
1 answer
1k views

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 ...
Jonathan Berlingeri's user avatar
1 vote
0 answers
109 views

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 ...
metalaureate's user avatar
2 votes
0 answers
373 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 ...
César Arquero Cabral's user avatar
2 votes
1 answer
159 views

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", "...
Miguel Guerrero's user avatar
0 votes
0 answers
96 views

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 ...
Sumit M Asok's user avatar
0 votes
0 answers
60 views

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 ...
Moop's user avatar
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1 vote
0 answers
48 views

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.
TeddyTedTed's user avatar
  • 6,130
2 votes
0 answers
339 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 (...
Eva 's user avatar
  • 21
2 votes
1 answer
197 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 ...
Aaron's user avatar
  • 111
0 votes
2 answers
129 views

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 ...
nathalia's user avatar
2 votes
4 answers
1k 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 ...
SwiftD's user avatar
  • 33
2 votes
0 answers
25 views

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 ...
ca1167tna's user avatar
2 votes
0 answers
120 views

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") ...
Jessie's user avatar
  • 21