Questions tagged [forest-ecology]

Forest ecology is the scientific study of the components and functions of a forest ecosystem.

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20 views

Estimating deforestation rate using Sentinel2/Landsat 8 imagery? [on hold]

I'd like to now if some index could allow me to estimate the deforestation rate temporary between 2 dates, for example by calculating the forest height. I know it's possible working with LiDAR data, ...
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1answer
37 views

Zonal Statistics only producing one line of statistics

I am by no means an expert in ArcGis, but I will try and explain my problem as clearly as possible. I am analysing forest cover data from the Hansen land-cover dataset ( data https://...
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0answers
34 views

Calculate % agriculture and % forestry cover across each 10km square of the UK

I am working on investigating the relationship between agricultural intensity and the diversity of birds. I have a shapefile of a map that splits the UK into 10km squares and for each square I need to ...
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0answers
25 views

Finding whether a particular band value is consistently less over a period of time in an image collection

The code below gives me forest regions of India from the Hansen data set and then I have filtered the landsat images of these regions from 2013-2019 on a quarterly basis. My output image is such that ...
3
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1answer
253 views

Visualizing vertical profiles from LiDAR point clouds in R?

I would like to visualize the vertical profiles of different LiDAR point clouds in different forest types. I have extracted the z-values from the LiDAR files with lidR and put them in a dataframe with ...
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1answer
70 views

How to identify understorey forest structure using airborne full waveform lidar data? [closed]

I am learning how to use lidar to study forest structures, but I cannot find any methodology on how to map understory trees. It is for a school project where I am mapping forest developmental phases ...
8
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1answer
116 views

Coarse Woody Debris extraction

I created very high dense point cloud of some forest plots using terrestrial laser scanner. Then removed points above 1.3 meter to see the coarse woody debris (Fallen dead trees). Attached is the ...
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1answer
54 views

Using Linkage mapper to build corridor between core forests? [closed]

I build corridors between core forests using the Linkage mapper (https://circuitscape.org/linkagemapper/). For inputs i used core forest (Polygon file) and resistance raster as 1 (uniform resistance ...
2
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1answer
119 views

Seeking Image similarity software?

Could anyone suggest a script/tool/software, that would: recognize and quantify the similarity/dissimilarity between the four attached images? Meaning, it would show that there is a greater ...
1
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1answer
122 views

How much do leaves on/off affect the number of LiDAR ground returns?

We would like to collect a generic purpose topographic LiDAR dataset over a large region in Belgium. Our minimum requirement is to achieve at least 1 point/m² on the ground. Ideally, we would like to ...
2
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3answers
69 views

How many forest clear cuts and how big are they?

I have forest stand characteristic data from northern Sweden. We have interpreted multiple years of aerial photos and now have polygons outlining different forest stand ages over time (e.g. clear cuts,...
3
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1answer
544 views

Classifying raster that takes neighbours into account?

I am working on classifying forest types using Sentinel-2 satellite imagery (10-m resolution; band-2, band-3, band-4 & band-8). I have ground-truthed field data as a training set. I want to set a ...
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1answer
478 views

Generating Canopy Height Model (CHM) with Quick Terrain Modeler?

I currently looking forward to process LiDAR point clouds (forest data) using Quick Terrain Modeler (QTM), but is it possible to create Canopy Height Model directly using the software?
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2answers
318 views

Identifying Joshua trees with LiDAR data?

I'm working on a LiDAR project to determine where Joshua trees are located within a specified study area. Due to the vegetation cover being so sparse, there are really on 2 canopy species there, which ...
1
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0answers
36 views

Defining soil classifications for Green Mountain National Forest based using SSURGO data [closed]

I'm a third-year undergraduate biology major with a focus in ecology. Referencing the methods laid out in A quantitative approach developing regional ecosystem classifications (Host et al 1996) I ...
1
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0answers
75 views

Modifying field values of shapefile based on values in another table? [closed]

I have a shapefile containing 500+ polygons. Included in this file is a unique ID for each unit, an area (in acres) and an attribute indicating whether that unit can be modified or not (1 or 0). I ...
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0answers
30 views

Creating polygon features composed of scalable points

I want to represent a forest using symbols I create (stylised trees). I considered two options: - A point feature. - A polygon feature. This is the one I'd use, as a forest is better represented with ...
3
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1answer
351 views

Calculate radius of gyration (average distance between cell and centroid cell)?

Radius of gyration (in the field of ecology) is a measure of the spatial extent of a habitat patch, and is defined as the mean distance between each cell in the patch and the patch centroid (cell-...
2
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4answers
2k views

Identifying individual trees and segmenting crowns from LiDAR CHM data?

I have a classified LiDAR point cloud for an area of 250*250 square meter, with 1 meter resolution. It has a 5 lakhs points with an average point density of 9 (means around 9 points within a pixel). ...
5
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2answers
298 views

Identifying individual pine trees without using LiDAR data?

Are there any ways to identify individual pine trees without the use of LiDAR data? Crown identification seems irrelevant. My goal is to do a rough treetop calculation to get an idea of how many ...
2
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0answers
29 views

How to detect undisturbed forest plot in Mudumalai National Park?

I am looking for undisturbed forest plot (without logging for at least 50 years) in Mudumalai National Park (India) or around it. How to detect it using GIS or remote sensing?
1
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0answers
128 views

Hard wood tree and Soft wood(shrubs) Vegetation Differentiaton

How I Differentiate Hard wood tree (like Mango, Sal) and Soft wood(shrubs like reed) Vegetation using Multispectral or Hyperspectral Image? I have TM, ETM, OLI, Hyperion, Aster Image and ERDAS 2011, ...
3
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1answer
297 views

Determining the best month for discriminating between different vegetation types?

I ordered and downloaded several (Surface Reflectance) Landsat 5-8 images from USGS Earth Explorer with the purpose of choosing a few of them to calculate some Vegetation Indices for each (NDVI, SAVI, ...
1
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0answers
150 views

Effects of heterogeneous vegetation in mapping canopy cover using randomForest in R

I have a 5.8 m resolution satellite image (LISS IV aboard IRS-P6, in the wavelength (micrometers): 0.52 - 0.59 (band 2),0.62 - 0.68 (band 3) and 0.77 - 0.86 (band4). The swath covers a densely ...
10
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2answers
1k views

Methodology for Hansen classification of Global Forest Watch?

I have just discovered amazing Hansen´s classification about forest loss and re-growth, available at http://www.globalforestwatch.org/, published in Science, 2013 as: Hansen, M. C., Potapov, P. V, ...
7
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1answer
335 views

Kriging to calculate forest biomass?

I am trying to create biomass map using Kriging from ground sample point. I have about 150 and 53 point plot for dense and sparse strata. The data is not normal so I have transformed it. After ...
3
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2answers
1k views

Which Statistical Test to use?

I aim to determine whether there is a correlation between terrain variables (elevation, aspect and slope) and structural information acquired in forest survey. I have used ArcMap's extract multi ...
2
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2answers
930 views

Mapping Rainforest Deforestation in Peru

I'm working on a project on the the rainforest deforestation in Peru. This is related to the work of http://www.coolearth.org/our-mission but I am not affiliated with the organization. I'm hoping to ...
-5
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1answer
351 views

Finding GIS data for range of coast redwood?

Where can I find GIS data showing where coast redwood trees (such as the one in the photo below from the 1800s) exist today?
1
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1answer
949 views

Where can I find the Forest Cover Density (FCD) mapping software

Does anyone know where I can find the latest Forest Cover Density (FCD) mapper software, as introduced in this paper.
1
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1answer
148 views

Seeking 4-band satellite imagery?

I'm looking for good quality, fine resolution 4-band satellite photos of Sweden for academic use (and I'm willing to pay for it). What I'm after is as detailed as possible photos of certain part of ...
2
votes
3answers
2k views

Forest Coverage - European free GIS datasets

Where can I find GIS data for the Forest coverage for the entire Europe? Is there such a product available for free? I am looking for raster or vector (polygons) with the information of the % of ...
3
votes
1answer
121 views

What function should I use to assess the degree of elevational change (rocky cliffs etc.) of a DEM?

I have a DEM of my research area and I want to assess how the topography/elevation changes. I am specifically looking to see what areas may be good suitable bat-roosting habitat so I am trying to ...
2
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0answers
89 views

How to interpret ArcGIS kernel density units when a population parameter is specified? [duplicate]

Possible Duplicate: How to interpret GRASS v.kernel results? The attached image shows trees in a study area based on their actual height in the field. The trees are overlaying a raster that was ...