Questions tagged [forest-ecology]
Forest ecology is the scientific study of the components and functions of a forest ecosystem.
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Create a forest mask from the Tropical Moist Forest dataset of JRC
I'm building forest mask from different datasets to evaluate the product agreements. I would like to create one from the information contained in the Tropical Moist Forest dataset from the EU Joint ...
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Knowing / defining sensing year from data to extract using Google Earth Engine JavaScript API
I extracted pixel values at given points in the Google Earth Engine from the vegetation cover data set MOD44B.006:
https://developers.google.com/earth-engine/datasets/catalog/MODIS_006_MOD44B#...
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Exporting file with layers from Google Earth Engine [closed]
I am brand new to using Google Earth Engine or coding in general. I have created a map in Google Earth Engine using Hansen Global Forest Change (tree cover and forest loss layers), Global Multi-...
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How do I produce a table of greening/browning trends for polygons I drew on my map?
I managed to create a Sen's slope map layer for my whole study area for Greening/Browning trends across a national park (I added a map of this below) but I am struggling to pull out greening/browning ...
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Point pattern analysis suggestions - at risk habitats
I have two point datasets across a state.
Locations that have sensitive vegetation and locations of threatened wildlife
Recorded locations of damage / degradation occurrences
The data as you'd ...
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Determine vegetation percentage cover from drone data in QGIS
I'm relatively inexperienced with QGIS.
I have a study site where I am testing multiple vegetation removal techniques to reduce fire hazards. I want to collect drone imagery before and 1 year after ...
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R Reprojecting global forest change rasters
I have been trying to calculate forest cover and forest loss in West Kalimantan Province, Indonesia, during 2000-2020. I use the gfcanalysis package in R for this purpose. Unfortunately, the minimum ...
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Masking bands in Google Earth Engine
I am working with the Hansen et al. forest loss dataset. Effectively, I am using these layers to compute the amount of forest cover (pixels) in a given area. However, the locations that were sampled ...
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Canopy Relief Ratio (Grid Metrics) FUSION/LDV
According to the paper cited below, CRR tells us about the shape of trees and is defined as:
Canopy Relief-Ratio (CRR) is a quantitative descriptor of the relative shape of the canopy from altimetry ...
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Creating forest mask using PALSAR Forest/Non-Forest Map for Sentinel 2 image collection
I trying mask forest areas in Sentinel- 2 image collection over my study area using the 25m resolution global PALSAR Forest/Non-Forest Map. I followed the masking example given in GEE guides that uses ...
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Problems with tree height in CHM
I did a drone flight over a forest plantation and got the DSM and DTM. Later, I was interested in calculating the height of the trees within a plot. For this, I did a subtraction between the DSM and ...
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How do you create a point within a polygon that is the farthest from all edges of the polygon in ArcGIS Pro?
I am curious how one could create a centroid for an irregularly shaped polygon in ArcGIS Pro, that lies within that polygon's boundaries, with the concept of centroid in this case meaning a point ...
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Seeking Moderate to High Resolution Forest Fire Before and After Images
I'm trying to search through the moderate to high-resolution satellite image data sets for imaging that shows forests both before and after a forest fire in order to assess the burn severity and the ...
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Using LiDAR to identify coniferous and deciduous trees
Is it possible to use only LiDAR data to distinguish between mostly coniferous and deciduous forest? I have a LiDAR data from spring and summer, but they have different point spacing.
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Optimizing identification of tree stand boundaries
I am working on a workflow to identify tree stand boundaries. My desired result is the blue lines - I know it will never be like that, but I need it to be as good as possible. My best result is the ...
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Identifying tree stand boundaries
I have a forest area, where I need to identify all the dividing lines between tree stands. I have a different amount of rastar files (RGB, NIR, DTM, DSM), and need an output with the boundaries as a ...
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Overstory-understory classification from discrete return aerial LiDAR
I have an opportunity to collaborate with bat biologists who are interested in predicting probability of roost occurence in seasonally flooded ponderosa woodland. We suspect that both properties of ...
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Weighted flow accumulation: using deforestation as weight?
Right off the bat: if a small river has 10% of its upstream catchment deforested, and a big river has 5%, I want that small river to have higher output values. But now it won't because of how much ...
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Falsecolor raster from multiple rasters in QGIS
How can I combine multiple single band rasters into a falsecolor RGB background in QGIS?
I can, of course, use the multiband color renderer to select specific bands, call them A1,A2,A3 from a single ...
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Intersecting multiple classified rasters
I have 3 raster files:
A transform aspect (TRASP) layer (classified into 2 strata-(0-0.5, 0.5-1))
A canopy cover layer (classified into quantiles-5 breaks)
A canopy height layer(classified into ...
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Summarize forest change by geometry, year
I am trying to calculate the forest change from the Hansen Global Forest Change dataset on Google Earth Engine.
My end goal is a columnar output of forest change by year by county.
I was able to ...
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Creating landcover map from KML files
I am trying to understand the effect of forest fragmentation on vertebrate populations. I need to analyse my study area using Fragstats however, I couldn't find a suitable land cover map for my study ...
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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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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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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 ...
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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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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 ...
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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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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 ...
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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 ...
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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 ...
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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,...
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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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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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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 ...
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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 ...
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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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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 ...
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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-...
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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).
...
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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 ...
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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?
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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, ...
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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, ...
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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 ...
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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, ...
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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 ...
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How to easily identify/classify coniferous forest from one date Landsat image?
I am pretty new in remote sensing and I am trying to identify/classify coniferous forest cover from single date Landsat scene. According to my preliminary web research I have these possibilities:
...
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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 ...
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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 ...
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