Search this forum:
Search
You are not authorized to create a new topic
Topics
 Replies
 Views
 Last Post
1 Replies and 447 Views ENVi Lidar--estimating tree heights  447  1 Started by  Jessica M. I am a M.S. student and plan on using ENVI Lidar as part of my thesis research in estimating tree height/canopy cover from Lidar data. I am not sure if the information is proprietary, but is there a way to find out/better understand how ENVI Lidar calculates the tree heights as part of processing the data I cannot seem to find information on the algorithm. Any information would be helpful and thank you!
1 447
by  Mari MinariJump to last post
15 Jan 2018 09:38 AM
0 Replies and 160 Views ENVI LIDAR AUTOMATICALLLY PROCESSED LAZ FILES  160  0 Started by  sani success PLEASE I UNDERSTAND THAT ENVI LIDAR WORKS AUTHOMATICALLY IN PROCESSING POINT CLOUDS, BUT WHICH ALGORITMS CAN WE DESCRIBE FOR THE VARIOUS PROCESS LIKE IN POINT CLOUD DETECTION, EXTRACTION AND CLASSIFICATION. I HAVE A LIDAR POINT CLOUD AND I NEED TO KNOW THE ALGORITMS USED FOR ALL THE STAGES OF ITS PROCESSING. AND ARTICLE TO MAKES REFERECE TO IN CASE OF A PUBLICATION
0 160
26 Dec 2017 09:50 AM
1 Replies and 401 Views RGB Data stretching  401  1 Started by  Luca Cicala Hello, I have a set of point clouds extracted from two images and saved in LAZ format. Once imported in EnviLidar, the color intensity is very low and hence the point cloud appears almost black in the main window. Even if this is not a problem for the ortophoto (it can be stretched in ENVI), it is quite annoing when I try to do some QA on the processed data. Any suggestion to stretch data in order to get a proper visualization of color data Thank you, Luca
1 401
by  Mari MinariJump to last post
13 Sep 2017 02:38 PM
4 Replies and 645 Views Point cloud classification in a forest area  645  4 Started by  Lucas ROSA Hello. My name is Lucas and I'm a beginner user of ENVI LiDAR. I was wondering if anyone here could help me with point cloud classification. I need to classify a forest area in 3 levels (strata): trees (above 1.3 meters); shrubs (between 0.75 m and 1.29m) and grasses (under 0.75m), each one represented by a different color. I read some guides but isn't clear for me yet how to do it in Envi lidar, can someone give me this little help or indicate a specific guide/tutorial
4 645
by  Mari MinariJump to last post
14 Jul 2017 11:17 AM
8 Replies and 651 Views The vectors appear to be shifted one half pixel  651  8 Started by  Paulo Olivas Hi there, I am trying to generate DSM (1m) and DEM (2m) from LIDAR data, but the problem I am experiencing is that the resulting DSM and DEM have one half pixel shifted. I tried to change extent in multiple ways but I was not successful. Any suggestions. Paulo
8 651
01 Mar 2017 09:55 AM
6 Replies and 341 Views Differences in the elevations for the same laz file in EPSG:27700 and the British National Grid proj  341  6 Started by  Hakim Benoudjit Hello, I've been working with the freely-available LiDAR DEM for the UK (UK LiDAR DEM) which uses the British National Grid projection (EPSG:27700) and is available in laz format (compressed laz files). I've found one issue with it: If I open the laz file, and in the Convert Format window set the input projection system to EPSG:27700, the elevations are different from when I click on Advanced and select the British National Grid projection. Although both projections are supposed to be the same...
6 341
08 Aug 2016 09:57 AM
1 Replies and 470 Views Run ENVI filter tools on LiDAR Canopy Height rasters  470  1 Started by  Jamie Ervin Hi, I originally posted this in the ENVI forum, but I'm re-posting it here because there seems to be a bug in that forum (thousands of posts in a foreign language are making the forum impossible to follow). I'm new to ENVI software, but I've got one simple thing that I'm hoping to do! I'm trying to perform a texture analysis on a series of LiDAR-generated canopy height models in either ENVI or ArcGIS. The height model rasters are in ArcGIS GRID format, and I'm hoping to a...
1 470
30 Jun 2016 08:47 AM
3 Replies and 342 Views Batch automation processing of .las  342  3 Started by  Elton Gjata Hi, I'm attempting to Batch process LAS tiles through Envi Lidar. I can successfully run Envi Lidar and process Ortho, DEM, DSM, Trees, Power Lines and Contours. Is it possible to run this script automatically for every .las file in a certain directory Thanks, Elton G.
3 342
26 Jan 2016 02:24 PM
2 Replies and 241 Views Using ENVI API to access functions?  241  2 Started by  jareds1 Hi all, I'm creating IDL scripts to allow the automation and scheduling of turning LAS data into raster data, and am fairly new to IDL scripting. It can be done with these ( http://bcal.boisestate.edu/tools/lidar)extensions from Boise Idaho with the ENVI interface pulled up, but I want to be able to do this with ENVI headless. Can I use a part of the ENVI API and functions to call an extension, or do I need to re-write the source code of the extensions Thanks!
2 241
05 Jun 2015 07:01 PM
1 Replies and 259 Views how to generate density map  259  1 Started by  DEEPTI YADAV How to generate density map from lidar data ...can it be done using ENVI or any other tool. I read somewhere about E3Dm but not able to find this software. Please suggest any method or tool to generate it and output it in tiff format.
1 259
31 May 2015 02:23 AM
1 Replies and 217 Views LiDAR E3De  217  1 Started by  DEEPTI YADAV I want to download software E3De. Can anyone suggest where can I find it. thanks.
1 217
29 May 2015 11:57 PM
1 Replies and 265 Views ENVI LiDAR Query  265  1 Started by  Kate Kear I had a question regarding ENVI LiDAR, in the ENVI window while viewing the point could or the vectors for various features there is an option to save the view as a picture in powerpoint or as a .bmp image. I wanted to know if it is possible to define the resolution (300 dpi or more) for the publication purposes and how is it done. The current dpi I am seeing is around 72.
1 265
17 Mar 2015 11:49 AM
5 Replies and 242 Views Classification function disable  242  5 Started by  Maoqi Sun I was exploring the tutorial video on ENVI website and found that processing data will classify the point cloud automatically.However, I found that there is no function as "show point features as classification" in my software. I am wondering why is it disabled in my version ofsoftware I've attached the screenshot.
5 242
11 Mar 2015 02:23 PM
1 Replies and 221 Views Show Point Features option is greyed out  221  1 Started by  Mari Minari After I import and process my Lidar data I would like to use Show Point Features to color the points in different ways. One option, Show Point Features by Source ID, is greyed out and not available for my dataset. Why is this
1 221
11 Mar 2015 01:20 PM
1 Replies and 232 Views Crown location  232  1 Started by  MichalB Is it possible to calculate automatically the height of crown location I've marked it by the red line on the picture linked below. In this way I could calculate the cone volume which can (more or less) represent crown volume. I can not find this information in the shape file attribute table. Crown picture
1 232
11 Dec 2014 01:57 PM
1 Replies and 197 Views Forest Density  197  1 Started by  Jevgenijs Filipovs Hello, I have already classified .las files. I want to use ENVI LIDAR to get Tree height raster and Forest density raster. I processed the data with default settings and then in the toolbox window pressed the Forest Density code. I got Tree Height raster but Forest density raster is empty, i calculated raster statistics and it's 0. Could suggest something Cheers, Jevgenijs
1 197
07 Apr 2014 02:11 AM
1 Replies and 193 Views Tree canopy.  193  1 Started by  Jevgenijs Filipovs Hi, Is a possibility with ENVI lidar create forest canopy shapes If is, please describe. And what are the maximum number of point possible load into ENVI lidar Best regards
1 193
18 Feb 2014 02:28 AM
1 Replies and 285 Views take real advantage of LiDAR classification already in LAS files?  285  1 Started by  Bruce Simonson Totally new to this product (installed today). Have loaded a sample set of LAS files, things look fine. Two quick questions: 1) Tried to show points, by classification. When ENVI-LiDAR displays the classification already in the LAS files (which appear to be very good to me), I get a gray-scale display. Is there any way to control the colorization of the existing point classifications in the source LAS files 2) Ran the automated processing, and got ENVI-LiDAR to pick out some of the featu...
1 285
18 Dec 2013 06:38 PM
4 Replies and 303 Views Error importing orthophoto  303  4 Started by  Oscar Castillo I am trying to import an orthophoto (.tif) and a popup message appears with this: Error fetching data for field "BitsPerSample" Thanks for your help! Oscar C.
4 303
24 Sep 2013 01:27 PM
You are not authorized to create a new topic


MOST RECENT

The Science, and Art, of Hyperspectral Image Analysis

6/7/2018

Harris Geospatial Solutions – June 7, 2018 Automation is being touted as the wave of the future for... more »

Bring DEMs to Life with the Topographic Shading Tool

5/30/2018

A digital elevation model (DEM) contains a wealth of information about the terrain in a given area;... more »

SIGN UP & STAY INFORMED

Sign up to receive the latest news, events, technologies and special offers.

SIGN ME UP