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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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 ...
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2answers
151 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 ...
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1answer
32 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
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36 views

.ecw viewer in java

I am trying to implement a map feature in my Java app (it needs to be a component), the maps I'm using are orthophoto maps in .ecw format. The problem is that I can't find a proper viewer for that ...
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19 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 ...
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56 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?
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24 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 ...
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23 views

Ossim-orthoigen command line program crashing upon opening W7

I have installed OSSIM via the windows installer (ossim-osgeo_x64_1_8_12-4.exe) found at http://download.osgeo.org/ossim/installers/windows/ I ran the installer on a 64 bit , 8 GB Ram, W7 machine. ...
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59 views

Why could imagery lose radiometric resolution after orthoresampling in ERDAS Photogrammetry

I have some issues with orthoresampling images in ERDAS Photogrammetry (formerly LPS). I've set up two different image blocks (including orientation and camera paramters) and created multiple digital ...
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3answers
297 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 ...
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2answers
166 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 ...
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91 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 ...
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2answers
438 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 ?
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0answers
524 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
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0answers
175 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.
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2answers
79 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 ...
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2answers
266 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. ...
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1answer
105 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 ...
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153 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 ...
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1answer
73 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 ...
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1answer
606 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, ...
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0answers
109 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 ...
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1answer
93 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 ...
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1answer
53 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 ...
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3answers
2k 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, ...
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1answer
175 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 ...
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2answers
662 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 ...
4
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1answer
720 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
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1answer
727 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 ...
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342 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 ...
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1answer
241 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 ...
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1answer
356 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 ...
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1answer
485 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 ...
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3answers
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 ...
2
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3answers
1k views

Batch script converting and resampling orthophotos

I would like to convert more than 300 orthophotos produced at scale 1:8.000 with a pixel size of 0.8m X 0.8m from Ecw format to Tiff format and after resampling pixel values. My aim is to batch ...
5
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3answers
2k views

Remove Collar from ECW File (Orthophoto Mosaic)

Maybe i'm missing a basic concept when it comes to manipulating/removing values from an RGB orthophoto mosaic. Is it possible to completely eliminate the collar (black background) from an orthophoto ...
2
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5answers
1k views

Free high-resolution Orthophotography for Quebec

Is anyone aware of free high-resolution orthophotography for Quebec? Something 1m resolution or greater would be ideal. I'm looking for imagery to use in a standard GIS as files (so not as WMS or ...