Questions tagged [ecognition]

Object Based Image Analysis software

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9
votes
6answers
2k views

How to programmatically check if the number of shapes = number of table records?

I have a handful of approximately 1000 shapefiles that are corrupted (see attached error message). The shapefiles were generated from eCognition Developer 8. There is a script tool that seems to ...
9
votes
4answers
2k views

How to distinguish buildings from vegetation in LIDAR data?

In order to extract the vegetation mask in ecognition, with object base analysis, with creation of the rule sets, the buildings were also classified! Any idea how to extract building from vegetation? ...
9
votes
1answer
2k views

Ditch Extraction using LIDAR DTM (1m resolution)

I'm trying to extract ditches using the LIDAR DTM using the software eCognition but I am actually having a hard time since the paper where I based my workflow entitled "Ditches’ network extraction and ...
7
votes
3answers
756 views

Extract DEM and DTM information from LIDAR image using E-Cognition

I´m trying to extract DEM and DTM from a LIDAR file. Currently, I rasterize the image but don´t know which algorithm I need to apply to obtain the DEM and DTM information in different models to be ...
6
votes
3answers
2k views

How to generalize training data for a random forest classifier?

I am working with a random forest classifier in eCognition (new with eCognition 9.0). The image shows 8 NAIP tiles I am attempting to classify using approximately 100 training points. The training ...
6
votes
2answers
2k views

How to know what spectrum image layers are in eCognition?

I'm learning to use eCognition (8.1) and my teacher has provided me with some example tif files to segment and classify. The tif files have multiple layers, each of which are supposed to represent a ...
4
votes
3answers
303 views

Estimating vegetation composition from digital images

I am running a Master's project researching Greater prairie-chicken nest and brood survival. Some of my intended covariates include local vegetation measures using digital imagery. I would like to use ...
3
votes
2answers
3k views

How to perform an accuracy assessment in eCognition?

How to do accuracy assessment of classified images in ecognition? I have done the image segmentation for Worldview-2 image. Then, I have processed for classification for class names (e.g road,...
3
votes
1answer
507 views

How to do separability analysis in eCognition?

Can I use eCognition to check which bands are more helpful to separate individual classes and to get output result? If so, how can I do this?
3
votes
2answers
1k views

How to filter by Selected Objects in eCognition?

I was wondering if there is any options in eCognition Developer to filter by selected objects. Suppose if I select some objects with polygon selection tool and want to use 'assign class'. In the ...
2
votes
1answer
819 views

Erode pixel areas in QGIS

I try to resize Pixel segments exported from eCognition. The goal is to erode the segments for one pixel of the boarder. So for example if the segment is 30px x 30px the result should be a new area ...
2
votes
1answer
1k views

How can I define hierarchical levels in eCognition

I'd like to define classes with 2 levels. Firstly I'm gonna classify some broad classes such as forest, grassland in a level 1. Furthermore, I'd like to classify these classes into some sub-classes ...
2
votes
1answer
105 views

Fixed Scale / Fixed Zoom in eCognition

I'm wondering if there is any option in eCognition Developer / Architect were I can control Zoom or Scale Factors. It's necessary for my work that I use the same scale for all processing steps.
2
votes
2answers
563 views

Nearest Neighbour Classification in eCognition

I have a few papers and youtube videos explaining how to conduct the NN classification in eCognition but it isnt giving me any output. I think the confusion is arising when trying to define the ...
2
votes
1answer
189 views

Duplicate Layers in eCognition

I am attempting to use eCognition Developer to segment and classify 5-band UAS imagery. When I go to create a new project in eCog and input my imagery (individually selecting the five .tif files), it ...
2
votes
0answers
33 views

Extracting object volume in eCognition?

I am a beginner in eCognition and am working on trying to extract volume for certain classified objects. When I extract volume with the ruleset given in the program it is the same value as the area (...
2
votes
0answers
129 views

Set a rule for grow region in eCognition

I am using the grow region algorithm in eCognition sofrware in order to merge my candidate class. I want to set the rule : two candidated objects are merged only if the length/width ratio of the ...
2
votes
0answers
93 views

Dissolve by Class in eCognition?

I have a lot of numbered classes in my eCognition project (version 9.0.1), which contains approx. 2 Mio. segments. All segments have been assigned to a class and now I want to merge them (basically do ...
2
votes
0answers
73 views

Black and white aerial image classification with ecognition fails to execute

I am trying to classify an image in ecognition, it gives a good number of well shaped polygons, but when I try to execute the classification, it only shows one class; I've done the same process for ...
2
votes
0answers
40 views

eCognition - prevent rounding of raster values?

I have a WorldView2 image, which I would like to segment and classify in eCognition. The image has been pre-processed to Top of the Atmosphere Reflectance, therefore hasvalues between 0-1. The ...
2
votes
0answers
179 views

Change Detection using Vector files [closed]

I have two shapefiles showing LULC of the same area for two different years; 1990 and 2015. Number of Polygons in two files are different but the number of class in both are same. Is there any way ...
2
votes
0answers
92 views

How to convert Whitebox .dep files for use in e-Cognition?

Could you explain me how can I convert .dep files into correct files to work in e-Cognition? I’ve exported the file in .sdat and .sgrd form using Export Layer, but I lose a lot of resolution. Any ...
2
votes
0answers
515 views

Setting region grow threshold by layer value difference using eCognition?

I'm trying to use the "grow region"-algorithm in eCognition Developer 9 on an yet almost unclassified 1x1 (=pixel resolution) chessboard segmentation. I classified nothing but my "seed points" by a ...
1
vote
3answers
290 views

The raster or shapefile exported from Ecognition does not align with the original raster when I open it in QGIS

The raster or shapefile exported from Ecognition does not align with the original raster when I open it in QGIS. I'm using Ecognition to classify a raster, but when I export the shapefile and open it ...
1
vote
1answer
822 views

Using shapefiles as a reference for accuracy assessment in ecognition

I classified my project and got an ESRI shapefile with points in it. Those points are hand made samples with the right class assigned to them. Now I need to use those samples to check my own ...
1
vote
1answer
544 views

Relational operation in eCognition

Is there anyone who has a experience with relational operation in eCognition. I'd like to ask 2 questions related to eCognition. 1. How can I classify the pixel values between 0.23 and 0.46 as a class ...
1
vote
1answer
286 views

Using thematic layer for segmentation in eCognition?

I have a thematic layer, i want to perform segmentation and classification only within the thematic layer,not in a whole image. how can i do it? I tried to segment the image after viewing the thematic ...
1
vote
2answers
525 views

Using texture in eCognition?

I would like to explore the possibility of using texture in an ecognition algorithm for classifying vegetation. Though, it seems to be based on sub-objects I am not sure how to actually create the sub-...
1
vote
1answer
1k views

How to use thematic layer for supervised classification in eCognition

I'm classifying vegetation in eCognition. From ArcMap I already have a shapefile with training polygons that I would like to use for this but so far I was only able to insert this as a thematic layer ...
1
vote
1answer
588 views

eCognition TTA Mask : Aerial images in ecognition for supervised classification

I am using eCognition Developer Trial 8.0. I have rgb Drone Otho foto. We want to classify this image for various biotope types exist in that region. We have already an existing classification as a ...
1
vote
1answer
319 views

How to make subset from satellite images without getting empty border?

I have Landsat 5-8 images, and after creating subset for the area of interest there is an empty border on the image as black part. How to remove it or how to create subset without it? Here is the view ...
1
vote
1answer
322 views

Performing object based image analysis of Landsat scene in eCognition Developer?

I am completely brand new to eCognition Developer and want to test out Object Based Image Analysis (OBIA) on a Landsat scene of one portion of the Chesapeake Bay. I have been unable to find any online ...
1
vote
1answer
232 views

identification of Forest cover area by using eCognition Software

How to find forest cover area by using eCognition software? I'm trying to find vegetation by using NDVI in the ruleset but it takes vegetation too with the forest. Can I use any other filter along ...
1
vote
1answer
596 views

Thematic layer in ecognition

I want to assign class by thematic layer in ecognition. I have digitized road edges and I want to classify the roads in my 'road class' using the shapefile (polyline) of my roads. How do I do this?
1
vote
1answer
366 views

How to define projection of a raster file in ecognition?

I have a raster file with no spatial reference. How can I define a projection for the image in ecognition software for classification purposes?
1
vote
1answer
373 views

Interpolating LiDAR: same steps but different results?

I'm new to eCognition, and today I tried to use LiDAR data in the program. First, I converted LiDAR to new image layers: 1) Elevation (first return) and 2) Number of Returns (all returns). I got ...
1
vote
1answer
776 views

Merging in eCognition

I know how to merge two polygons in ArcGis, I have tried to merge two unclassified polygons as one in eCognition for a while now and nothing is working. still remains two separate polygons. Can ...
1
vote
1answer
375 views

Automatic Land Cover Classification Method in eCognition?

I'm exploring several methods of classifying multi spectral data in eCognition. The classification will be fairly high level; I'm not trying to find individual species but want to identify areas of ...
1
vote
1answer
169 views

Where to see smallest size of segmented object in eCognition?

I used ecognition to conduct segmentation, and I'm wondering where I can see the segmentation result, like the smallest size of object segmented.
1
vote
1answer
145 views

Comparing unclassified super-objects with classified sub-objects

I have two shapefiles exported from ecognition. The first shapefile contains the land cover classification and the second one contains unclassified superobjects of the first shapefile. I want to ...
1
vote
1answer
646 views

How to link two different images in eCognition

I'd like to link two different images in eCognition to find the same pixels on both images. The images have same projection (geog lat/long). How can I do this?
1
vote
0answers
26 views

How can you identify loam/clay settlements with Sentinel-2 Images when using eCognition?

I am doing my thesis research about analyzing settlements in Mali with Sentinel2 images with the use of the program eCognition (object-based). We have trouble with determining the settlements because ...
1
vote
0answers
39 views

eCognition- is there an 'undo'

I'm using eCognition developer trial, and when developing a ruleset in the process tree sometimes I make an error. However, just deleting that line of code (after extracting) doesn't undo that line in ...
1
vote
0answers
15 views

Quantifying level of urbanization of catchment over time?

I am studying the impact of urbanization on the discharge levels of a river during flooding events. For this, I need to determine the catchment's percent urbanized area through land classification ...
1
vote
0answers
58 views

LiDAR first and lastreturns eCognition [closed]

Recently I downloaded the new version of eCognition Developer. I remember that before when processing LiDAR data by using algorithms it is pretty easy to generate LiDAR first and last returns. ...
1
vote
0answers
206 views

ecognition- template matching result export

I am doing template matching for tree detection purpose using ecognition software. When I export the point layer result from ecognition into QGIS using the 'export the existing vector layer function', ...
1
vote
0answers
264 views

How to perform accuracy assessment in eCognition?

I have already done the classification using Nearest neighbourhood, and how do I continue to complete AC with TAA?
1
vote
0answers
352 views

import training samples on ecognition [closed]

How can I import these shapefile as training samples for each land use class hitachy in ecognition software? After importing step, how can I category land use classes?
1
vote
0answers
63 views

Corrupted Image Layer of DPR File (eCognition Project)

I just started working with eCognition a few months ago and it is my first time to encounter a problem. I was on the refinement stage (and almost done manual brushing objects) when I found out that ...
1
vote
0answers
633 views

Segmentation boundaries image in eCognition [closed]

I need to save the segmentation result (boundaries image) as a raster file using eCognition. Anybody can give me some directions about this?