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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2
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1answer
38 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 ...
0
votes
0answers
24 views

White pixels in rasters opened with QGIS Essen

When loading raster images (orthophoto) in QGIS 2.14.0 Essen (also in Lyon) there are many white pixels displayed. This problem did not exist with older versions of QGIS (using the same raster ...
1
vote
0answers
51 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 ...
0
votes
0answers
16 views

Converting USGS (2010) GeoPDF to GeoTIFF

I'm having problems on coming up with Topo maps by converting USGS 2010 GeoPDF Maps to GeoTiffs (while removing the Orthoimage). I'm currently using GDAL in the conversion process. What happens is ...
0
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0answers
40 views

How to calculate vertical exaggeration in stereoscopy?

How can I calculate the 'seen' vertical exaggeration of my set of orthophotos, when working with a stereoscope? What factors determine it?
1
vote
2answers
129 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 ...
0
votes
2answers
37 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?
1
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0answers
44 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 ...
3
votes
1answer
104 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 ...
1
vote
1answer
63 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 ...
2
votes
0answers
37 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 ...
3
votes
2answers
51 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 ...
0
votes
0answers
10 views

How to change the pixel aspect ratio of a raster? [duplicate]

I hva a raster where the pixel size is (0.000000610870000,-0.000000273755000), but I'd like them square (e.g. (0.000000234155000,-0.000000234155000)). Is there a way to accomplish this using GDAL? ...
0
votes
0answers
27 views

Zoom beyond level z16 with MapBox Studio Classic

I've loaded a georeferenced TIFF over a university (NTNU) into MapBox Studio. The fist problem is that everything is black, and I have to use the longitude/latitude of the area to find it. Second, and ...
1
vote
1answer
34 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 ...
1
vote
0answers
31 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 ...
1
vote
2answers
53 views

USGS National Map Ortho - Digitizing

As a part of project scope we have to deliver to the Client digitized data sets – some houses and roads. Can we use USGS Orthoimagery from The National Map layer for feature digitizing? ...
2
votes
1answer
81 views

Image cache on network drive vs. SDE/Oracle

We currently have all of our image data loaded into ArcGIS SDE/Oracle 9.3. There is a proposal to not load our 2015 orthoimagery into SDE/Oracle in order to save time and place it in a tile cache or ...
-7
votes
1answer
49 views

how to determine whether the flight is reasonable [closed]

in a mountainous area a flight with 87% length and 63% side overlap was flown (both overlaps referring to the valley). the average flight height above the valley was 4800 m, above the summits it was ...
0
votes
0answers
38 views

Spliting Raster Ortho to 8-bit Tiles

I'm trying to split a large orthophoto to smaller tiles in order to use them as textures on DEM tiles the same size in CityEngine. I've been using the Split Raster tool in ArcGIS to try and output ...
0
votes
2answers
579 views

Orthophoto Free Download?

I'm looking for Image datas for East Africa. Specifically for Rwanda. Does anyone know if such data are available at all free? My target is to digitize roads and buildings with the help of image ...
0
votes
1answer
50 views

White Pixel in Raster (CIR) arcmap 9.3

i have to analyse forest cir orthophotos. in high scale resolution, many white pixel appear instead of red ones. i work with arcmap 9.3, win7
0
votes
0answers
25 views

How to manually apply permanent ArcGis Stretch images filters out of box?

I usually use Arcgis image stretch filters for my images to make them sharpen or to highlight certain elements of a raster like this: Version without filters: Version with filter: How can i apply ...
1
vote
0answers
108 views

extract roads, railways and canals out of old orthophoto

how is it possible to extract the roads, canals and or railways out of this image (black-white)? Or how is possible to create lines at the edges of the roads, canals and or railways?
1
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0answers
27 views

Geometric quality of orthophotos

I have a lot of historical orthophotos, like the year 1950 of a region I have also of the same region the orthophotos of more recent years such as 2012 The question is how to compare and quantifying ...
2
votes
3answers
673 views

How can I identify types of crops in agricultural raster dataset?

I have some 2014 MrSID files from the National Agricultural Imagery Program (NAIP) that I've converted to TIFF files. I want to use them to find the area of tomato farms in a watershed. I'm using ...
3
votes
2answers
322 views

Compression Artifacts and GDAL

I am working with large tiled (no overlap) datasets of ortho imagery that has been mosaicked in ArcGIS and exported as a single, merged TIF for the entire AOI. These images need to be compressed so ...
2
votes
0answers
140 views

Georeferencing declassified CORONA images of coastlines?

I'm trying to georeference declassified CORONA images of coastlines in order to asses coastline changes and human impact. In most case, georeferencing is easy, but since images of coastlines can only ...
5
votes
3answers
540 views

UAV Image collection Procedure

Do we need to collect ground control points before flying drones or do the drones collect control points during their flight ?
3
votes
0answers
1k views

Best practice for aerial photo stitching and georeferencing

I need to georeference 53 air photos from 1981 (1:25,000 scale) and was wondering what would be the most efficient, defensible, and accurate option. For context, the air photos are following a highway ...
2
votes
0answers
249 views

3D visualization of terrain data and orthophoto using GRASS NVIZ via QGIS

How can I make 3D visualization of terrain data and orthophoto using GRASS NVIZ via QGIS? I am quite new with GRASS. I have only managed to get a 3D view of the terrain so far.
0
votes
2answers
128 views

Problem with mosaic orthophoto

I am trying mosaic my orthophotos with ArcMap and Qgis as well. But every times the intersected area will be white color. I know its something about this frame around my pics but normally it is ...
0
votes
2answers
1k views

Is there a simple way to clip multiple layers and orthophotos?

(*disclaimer, I don't know any Python/scripting) Ok, so I have clipped several layers in the past using Arcmap 10.+, but I am having a hard time wrapping my head around how hard it can be at times. ...
1
vote
1answer
186 views

Extracting DEM from imagery using ArcGIS for Desktop?

I'm using ArcGIS for Desktop and I'd like to know how can I extract the elevation model from a imagery of photos. I have the have each image (jpg) geo referenced. After, I don't know what tool may use ...
0
votes
0answers
228 views

Extracting rooftops using MATLAB

I am using Matlab to extract rooftops of buildings and I want an orthoimage i.e. a .jpg file, a world file .jgw and a shape file .shp as input. A mask is needed to "hide" the pixels of the image ...
0
votes
1answer
115 views

Unable to get processing extent to match desired raster output

I have a few thousand ortho mosaic tiles that I've resampled to a lower GSD and am trying to cut into larger tiles. I developed a script that has worked perfectly for thousands and thousands of tiles ...
1
vote
1answer
1k views

What is the best way to ortho-rectificate image from the plane?

I am very new in GIS and I am trying to ortho-rectificate my images. But after putting it on the map I see that results are not precise. We have images taken from the airplane, it's longitude, ...
0
votes
0answers
140 views

Need help with GeoExpress 9 by LizardTech/ArcGIS Server 10.1

This is a multi-part question and after much reading on different forums I still could use some help/advice. My setup: ArcGIS Desktop 10.1, Dedicated Server for GIS data with SQL Server 2008 R2 and ...
2
votes
1answer
107 views

Raster clipping over 1300 km2 orthophotos

I have all of Denmark in 25 cm orthophotos added to my ArcMap (mosaic dataset). I've added a polygon of an area covering over 1300 km2. I've used the raster clip tool to clip the data into a new ...
1
vote
1answer
66 views

Fill no data area over ocean in orthophoto mosaic

We have recently received orthoimagery tiles for my county. The county is a series of islands and the imagery only covers the islands. Thus we have data gaps where there is only water. In past ...
6
votes
4answers
4k views

Software for Stitching Aerial Photographs?

I am looking for software that is capable of stitching together large number of aerial photographs. The photos are taken with a high quality DSLR from a small helicopter, they cover about 100 meters, ...
4
votes
1answer
264 views

Do OrthoRectified Images have shadow?

Orthorectified images have removed relief displacements and tilt displacements. Since the assumption of orthorectification is to keep the light source at infinite distance so that the light rays are ...
3
votes
2answers
1k views

how to add orthophoto layer in qgis

I am not an advanced user, but I try to be oneday :) here is my issue: I have tracks (just waypoints) from my GPS in gpx format. I also have orthophoto pictures in tif format, that I would like to ...
5
votes
1answer
1k views

What is the correct way to merge adjoining raster images?

I am trying to create a raster base layer from NAIP ortho imagery. Unfortunately for me, the area of interest is very near the intersection of four image files. I have tried a few approaches to ...
3
votes
1answer
1k views

Why is Orthorectify button not active in Image Analysis Windows in ArcGIS10?

I wanted to Ortho rectify GeoEye HR imagery using existing RPC and IFSAR DTM in Image Analysis. According to ArcGIS Resource center ...
2
votes
0answers
430 views

Geospatial Tools for SketchUp

I was wondering if anyone knows of geospatial tools that work in SketchUp? I know if GeoSketch, which allows a user to import ortho imagery, DEMs, shapefiles and GPS enabled photographs into SketchUp ...
1
vote
1answer
329 views

How to apply DEM elevation adjustment parameters?

I have a nice DEM, created from UAV data, which I want to process further in QGIS, my platform of first choice. In order to represent the evelation of each pixel correctly, I have to adjust the ...
1
vote
1answer
462 views

ArcScene 10.1 Orthophoto Visualization Issue

I am attempting to visualize an orthophoto in ArcScene 10.1 at the same resolution it is at in ArcDesktop 10.1. I have set the "Quality enhancement for raster images" to it's highest extent. But, the ...
1
vote
1answer
567 views

Why is the imported TIFF file distorted with noise in Quantum-GIS?

I've a TIFF-file. Loading the raster image into QGIS does not display correctly. (Using the Add raster layer button.) It seems to be distorted with noise. See image below: The source of the TIFF ...
3
votes
4answers
2k views

Looking for an efficient way of digitizing building footprints using orthophotos and ArcGIS 10

In the past I've used PCI Geomatica to do something similar using the softwares classification functionality. Are there some tools/tricks in ArcGIS that will partially automate the process. I remember ...