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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90 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 ...
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1answer
44 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 ...
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1answer
44 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 ...
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1answer
51 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 ...
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11 views

ArcGIS Pro 3d scene production

I am trying to do a simple 3D scene with orthophoto raster mosaic and DEM. The problem is that not all orthophotos render (are visible). Only approximately 50%. If I have 9 orthophotos in a mosaic, ...
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2answers
24 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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17 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 ...
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22 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 ...
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1answer
24 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:
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40 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 ...
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1answer
56 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)
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130 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, ...
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1answer
46 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 ...
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94 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 ...
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33 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 ...
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1answer
130 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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1answer
245 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 ...
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2answers
93 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 ...
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65 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 ...
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43 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....
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1answer
580 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 ...
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65 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 ...
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232 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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84 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", "...
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47 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 ...
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50 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 ...
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30 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.
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183 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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1answer
118 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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2answers
90 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 ...
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4answers
725 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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22 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 ...
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0answers
65 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") ...
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1answer
478 views

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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68 views

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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38 views

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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1answer
67 views

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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1answer
111 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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0answers
124 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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1answer
462 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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2answers
158 views

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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1answer
717 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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1answer
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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0answers
87 views

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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0answers
224 views

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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1answer
79 views

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 ...
2
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1answer
207 views

QGIS upload Ortho NAIP raster layer problem - loaded a raster file, georeferenced, however is blurry

Relatively new QGIS user. I am trying to correctly upload an ortho NAIP file I got from the USDA geospatial gateway. I successfully uploaded the raster layer from a .sid file of a county. As I zoom in ...
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0answers
120 views

Using Orthophotos - not multispectral - to generate Object-oriented image classification vectors?

I'm using QGIS version 2.14.3-Essen on a Macbook pro. I'm sort of new to this and feeling my way through this. I have high-resolution Orthophotos officially sourced from local country in Sub-saharan ...
2
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1answer
54 views

Automatic extraction of manually selected points in ArcMap [closed]

I have an Orthomosaic and a DEM (both are in Geotiff formats and have RGB values) of a site, and I want to check their accuracy. For this purpose, I measured the 3D location (with mm accuracy) of some ...
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2answers
236 views

Making a TIN from an orthophoto

In ArcGIS for desktop I'm trying to create a TIN from an Orthophoto that has control points, the photo is high quality and has a huge amount of control points. I'm just having issues creating the TIN ...