Latest Contributions by DonaldPirie-Hay

‎01-08-2015

First time 3D modelling here. Looking for some simple steps to help guide me along to making a fairly simple 3d model starting from xyz and/or las files. Ideally I'm looking to create a model that will show vegetation, as can be calculated from las files and las datasets. Really new to this, so any help is greatly appreciated.

‎01-05-2015

The Habitat Suitabillity is a separate raster, as is elevation, aspect, and slope. I meant there is no option to "Open Attribute Table" for any of the rasters mentioned above. Same for any Join or Relate options. I will try the Combine tool to see if that works.

‎01-04-2015

I am attempting to create a series of bivariate maps of an index of habitat suitability (point data) with elevation, slope, and aspect. Because there is no attribute table for any of the data, they cannot be joined. However, I am wondering how (if it is possible) to join and map the zonal statistics of the two datasets. I have zonal statistics of each one in the same format. Can they be joined in one file to show the unique values of both sets of data? the Join Field tool doesn't seem to work. The output would be a bivariate map of habitat suitability and elevation, another of habitat suitability and slope, and one of habitat suitability and aspect. The goal is to create choropleth bivariate maps to show the relationship between the habitat suitability and the geographical features. I have to present it this way, so other mapping suggestions are out the window. Any suggestions are greatly appreciated.

‎01-04-2015

I am attempting to create a series of bivariate maps of an index of habitat suitability (point data) with elevation, slope, and aspect. Because there is no attribute table for any of the data, they cannot be joined. However, I am wondering how (if it is possible) to join and map the zonal statistics of the two datasets. I have zonal statistics of each one in the same format. Can they be joined in one file to show the unique values of both sets of data? the Join Field tool doesn't seem to work. The output would be a bivariate map of habitat suitability and elevation, another of habitat suitability and slope, and one of habitat suitability and aspect. The goal is to create choropleth bivariate maps to show the relationship between the habitat suitability and the geographical features. I have to present it this way, so other mapping suggestions are out the window. Any suggestions are greatly appreciated.

‎01-04-2015

How do I manually divide the island into these areas? And I want to aggregate the points in 5 or 7 areas to create a bivariate map with some other data.

‎01-03-2015

I'm trying to make a bivariate choropleth map of an island. I have point data of several features, elevation, slope, aspect, etc. I'm trying to aggregate these points into large areas of the island, preferably 5 or seven areas. I know I can use the aggregate tool, but I lose the shape of the island. Is there a way to accomplish the same aggregation without losing the exact shape? Any help would be greatly appreciated.

‎10-21-2014

I will take a look at the multiple point returns, good idea. Thanks for the offer but I am not able to share the data as I am under agreements of its use with my employer. The LiDAR data was provided by Leading Edge Geomatics.

‎10-10-2014

The study is Baccalieu Island Ecological Seabird Reserve, Newfoundland, Canada. It has the highest concentration of breeding Leach`s Storm-Petrels in the world, and as such, is an extremely important island in various ecological facets. The goal is to characterize habitats and determine their extent and area to better estimate the amount of Storm-Petrels that breed on the island. As for the habitat differentiation, ideally it would be divided into Forest, Fern, Grass, and Barren. Whether Fern is consistently high enough to distinguish from grass remains to be seen. There are also a couple of lakes and small rocky areas, as well as the remains of an old lighthouse, but other wise the island consists of the first four habitat types listed. Thanks again for your advice.

‎10-09-2014

The LAS files are indeed classified, but as specific as I am looking to do, nor are they 100% correct. The LAS files have classes of low, medium, and high vegetation, but there are only points of low vegetation, and zero returns that are classified as medium or high vegetation. I have been on the island and ground truthed many areas, and there are distinct areas of grass, and others of forested (high trees). Based on this, there should at least be some points classified as medium or high vegetation. The area I am investigating is a small island. The water around the island is also incorrectly classified as ground. I am not sure if it is even possible to edit or correct the inherent classifications. At this point, to distinguish habitats, I plan to create a DEM and a DSM, for the exact same area, and the difference between them should give different vegetation levels. Does this make sense? In creation of a DEM from an LAS dataset, I need to use a filter, but I do not know what points to filter. Oh, and I am still waiting on the metadata for the LiDAR data, when I receive it I will communicate its sources. Leading Edge Geomatics provided the data.

‎09-19-2014

Thanks Ian, I have very little experience working with Lidar data, and as such, I'm really just learning it as I go here. I have a basic grasp of it so far. I will look into this paper, and other related ones, thank you very much for your help so far. It is greatly appreciated. Should I have further questions or more specific ones, I will keep them in this thread. Thanks again.

‎09-12-2014

Hi there, I have a project in which I have been assigned to characterize different plant habitats (fern, grass, forest, and barrents) on a small island, using LiDAR data. The data I have consists of LAS and XYZ files, in addition to TIF and contour shape files I am already in possession of. Does anyone know how I got from LAS datasets (or any derivative of the files I have) to start to characterize habitats? Any and all help is greatly appreciated, Donald Pirie-Hay

Online Status	Offline
Date Last Visited	‎11-11-2020 02:23 AM

My Ideas

Latest Contributions by DonaldPirie-Hay

How do I create a simple 3d model using xyz or las files

Re: How to I aggregate raster points into equal areas, and still preserve input shape

Re: How to I aggregate raster points into equal areas, and still preserve input shape

How do I join two different sets of zonal statistics

Re: How to I aggregate raster points into equal areas, and still preserve input shape

How to I aggregate raster points into equal areas, and still preserve input shape

Re: How does one characterize habitats using lidar data (LAS files, LAS datasets, xyz files)?

Re: How does one characterize habitats using lidar data (LAS files, LAS datasets, xyz files)?

Re: How does one characterize habitats using lidar data (LAS files, LAS datasets, xyz files)?

Re: How does one characterize habitats using lidar data (LAS files, LAS datasets, xyz files)?

How does one characterize habitats using lidar data (LAS files, LAS datasets, xyz files)?

How does one characterize habitats using lidar dat...