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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20 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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Using another imagery for reference of GCPs in PhotoMod software for DEM generation process?

As I am novice to the Photomod software, I can only find the option to import GCPs (.csv or txt) or TIN to generate DEM. If I want to use another already Ortho-rectified image as a reference, how can ...
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15 views

Correctly locating .ecw orthophotos with .aux sidecar files

I have a set of .ecw files with accompanying .aux files: Here I read that these .aux files may contain: Coordinate system Transformation Projection information When I import only the .ecw file in ...
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23 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
43 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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63 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
31 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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52 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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26 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
60 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
116 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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65 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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40 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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39 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
356 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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62 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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171 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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71 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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46 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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49 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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28 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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135 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
106 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
66 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
494 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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21 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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57 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
361 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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64 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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32 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
62 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
110 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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104 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
333 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
100 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
575 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
5k 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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85 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
211 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
78 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 ...
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1answer
174 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
116 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 ...
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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
217 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 ...
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1answer
113 views

Identifying and Placing Points on DEM Features using ArcGIS Desktop?

I am using UAV acquired imagery to identify trees at a peat land in the UK. I have a DEM and an Orthomosaic which i have created which can bee seen here (note: the Orthomosaic is at a much higher ...
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1answer
152 views

Overlay orthophoto with DTM

I am having a .dxf DSM and a georeferenced .tiff orthphoto. I would now like to simply overlay the orthophoto onto the terrain for visualization purposes. The DSM contains buildings, whose triangles ...
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1answer
841 views

OpenDroneMap: How to produce correct georeference ortophoto from UAV?

I am trying to produce proper georeferenced ortophotomap from UAV mission using OpenDroneMap (ODM), like I have done the same thing using APS Suite from Menci In both cases I have the same images with ...
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0answers
81 views

Cutline mosaicing areal imagery with open source software [closed]

I'm very new in gis, and i'm trying to find a fast solution to merge 200 historical areal images(black and white from 1944). I orthorectified them manually, using gcp-s. They have 1 to 10 meters error....
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2answers
383 views

Geoserver WMS raster problem

I have the following problem: The edge of the imagemosaic is not fit well, Im using geoserver imagemosaic tool to serving orthophotos through wms server. Is it a CRS, Bounding Box problem?
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1answer
94 views

Using orthophotos as basemap in CartoDB? [closed]

I have seen a java example of how to use a raster overlay in CartoDB, but what about replacing the basemap entirely with orthophotos? In the web GUI for selecting basemap there is an option for the ...