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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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37 views

How to import orthomosiac from metashape into QGIS and preserve ortho apperance?

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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14 views

Calculate canopy openness using RGB mosaic from UAV orthorectified aerial images

Canopy openness of trees was obtained easily from digital photographs processed with Gap Light Analyzer. Image processing involves the transformation of image by the division of pixel intensities into ...
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44 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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65 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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36 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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30 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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37 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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18 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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76 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
69 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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47 views

Orthorectification on a DSM

I would like to orthorectify on the features (trees and buildings), noted that with may cause some stretching or tearing on the image due to the obliquity of the look angle. I'm only interested in top ...
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2answers
35 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
205 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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11 views

Raster Clip of Ortho Imagery (Keep Red, Blue, Green Bands)

I'm using the Raster Clip tool to clip ortho imagery to county boundaries. It works fine and looks great, except in ArcCatalog it saves 4 files: Filename, Filename1, Filename2, and Filename3. I think ...
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52 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
160 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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53 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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29 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
53 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
98 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
86 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
200 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
76 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
403 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
3k 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
64 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
162 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 ...
2
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1answer
74 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
127 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
109 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
51 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
176 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
96 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
121 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 ...
4
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1answer
660 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 ...
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0answers
68 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
316 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
83 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 ...
3
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1answer
334 views

Creating fishnet grid polygon layer from set of ortho rasters in ArcGIS for Desktop?

I have a set of ortho slides (SID format) for my city. The slides do not overlap, and cover the entire city and immediate environs. What I want to do is create a grid-like polygon layer with separate ...
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0answers
307 views

Storing non-orthorectified images in GeoTIFF

I'm reading GeoTIFF and GDAL documentations and I'm trying to understand what type of transformations are supported. GeoTIFF documentation says you can use ModelTransformationTag to define a ...
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3answers
3k views

Can I download Google Map Orthophotos using QGIS?

Does QGIS have functionality to download Google Map Orthophotos? Or any other open source GIS? I specifically want to be able to not only view Google Maps on my GIS, but also be able to download the ...
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2answers
239 views

Index TAB for large raster files

I received a batch of aerial images along with an index file that essentially tells me which aerial image covers each 20x20km tile. Can I also create this type of index TAB through MapInfo?
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0answers
117 views

Aerial mosaic of thermography

I have a large set of aerial images (thermography) some of them are very tilted due to the airplane turning. I want to merge all the images into a unique orthorectified image. I have not the GPS ...
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1answer
690 views

Can't generate true orthophoto from my software

I am a GIS specialist and a surveyor. Lately I'm trying to use as a surveying tool my DJI Phantom 3 pro combining with different software for generating DEM, DSM, 3d model and orthophoto. But I can't ...
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1answer
310 views

Current Leaf-off HiRes Orthophoto Alternatives to Pictometry

Our nonprofit organization has subscribed for several years to Pictometry's aerial orthoimagery. Where there is coverage (in most metro areas), the quality of the leaf-off imagery has justified the ...
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1answer
89 views

Measure building lean in ArcMap?

I was wondering if anyone is aware of any tools that are available to measure building lean in ortho images from within ArcMap. I am aware of calculations and processes that can be used to measure and ...
2
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2answers
201 views

Working with orthophotos on an SSD drive vs HDD drive: is the performance gain significant?

I'm shopping for a server that will allow my coworkers to use QGIS through a terminal server. We have 2 Tb of orthophotos in tif, twf, ecw and shapefiles format. They tell me that actually when they ...
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1answer
84 views

Extract metadata with arcpy from orthoimagery

I'm very new to ArcGIS, and GIS is general. I am trying to build a script that will extract metadata from orthoimagery .tifs. Below is my test code to see if I can get the metadata from one file. It ...
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0answers
67 views

Automatically applying a local ortho projection using the center of the raster layer extent

I would like to take a raster image read the layer extents, extract the center point and then apply a custom local ortho projection with the origin set to the extracted center point. Can anyone ...