Skip to main content

Questions tagged [forest-ecology]

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

Filter by
Sorted by
Tagged with
0 votes
1 answer
43 views

Looking for Landsat imagery from 1986 for Paraguay

I have accessed many websites such as USGS, NASA, Earth explorer. Somehow none of them has access to the image in the location I need or when I use the USGS website I get a warning that says: The ...
Rachele's user avatar
  • 11
0 votes
1 answer
27 views

Change color when I finish to take notes in every point every week

During the collection data on field (ecology and phenology data) on different days I would like to change the color of symbol when I finish to take notes in every point in a concret day. How it would ...
Mery13484's user avatar
0 votes
1 answer
84 views

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 ...
Pierrick Rambaud's user avatar
0 votes
1 answer
32 views

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#...
Mark's user avatar
  • 29
1 vote
1 answer
459 views

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-...
Alexander Atkins's user avatar
1 vote
0 answers
88 views

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 ...
sofii's user avatar
  • 11
2 votes
0 answers
22 views

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 ...
kmgis's user avatar
  • 21
0 votes
0 answers
131 views

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 ...
Brian Allen's user avatar
0 votes
1 answer
145 views

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 ...
Ing's user avatar
  • 1
0 votes
1 answer
605 views

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 ...
Makopet's user avatar
  • 45
2 votes
1 answer
570 views

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 ...
Arthur_Morgan's user avatar
0 votes
1 answer
584 views

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 ...
Monish's user avatar
  • 131
0 votes
0 answers
166 views

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 ...
Javier Hernández's user avatar
2 votes
2 answers
800 views

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 ...
Brewkeeper's user avatar
0 votes
0 answers
30 views

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 ...
Jacob's user avatar
  • 9
1 vote
0 answers
331 views

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.
swisscheese_95's user avatar
7 votes
1 answer
211 views

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 ...
DyndeMachine's user avatar
5 votes
2 answers
710 views

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 ...
DyndeMachine's user avatar
1 vote
0 answers
61 views

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 ...
kdoherty's user avatar
2 votes
0 answers
94 views

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 ...
Olivier's user avatar
  • 105
2 votes
1 answer
771 views

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 ...
Houska's user avatar
  • 8,196
1 vote
1 answer
82 views

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 ...
Arthur_Morgan's user avatar
0 votes
1 answer
83 views

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 ...
macworthy's user avatar
1 vote
0 answers
84 views

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 ...
Keerthi Krutha's user avatar
0 votes
1 answer
231 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://...
Adam Bermingham's user avatar
1 vote
0 answers
90 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 ...
Bex Jenkins's user avatar
2 votes
0 answers
57 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 ...
Reema Mathew's user avatar
4 votes
1 answer
2k 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 ...
S.K.'s user avatar
  • 347
1 vote
1 answer
193 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 ...
gigi's user avatar
  • 27
8 votes
1 answer
230 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 ...
Sher's user avatar
  • 894
0 votes
1 answer
248 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 ...
Deepa's user avatar
  • 17
2 votes
1 answer
326 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 ...
Tom's user avatar
  • 47
2 votes
1 answer
461 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 ...
radouxju's user avatar
  • 49.8k
2 votes
3 answers
107 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,...
EMH's user avatar
  • 21
5 votes
1 answer
2k 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 ...
user3386170's user avatar
  • 1,977
1 vote
1 answer
1k 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?
Farhan Rajuli's user avatar
9 votes
2 answers
542 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 ...
Tommy JH's user avatar
  • 113
1 vote
0 answers
55 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 ...
E Guerra's user avatar
1 vote
0 answers
81 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 ...
K. Credo's user avatar
  • 256
0 votes
0 answers
44 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 ...
Michele Cordini's user avatar
3 votes
1 answer
944 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-...
K. Credo's user avatar
  • 256
2 votes
4 answers
4k 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). ...
bibinwilson's user avatar
5 votes
2 answers
362 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 ...
user66913's user avatar
2 votes
0 answers
35 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?
Odarka's user avatar
  • 31
1 vote
0 answers
168 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, ...
Sk Majharul Islam's user avatar
5 votes
1 answer
434 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, ...
Simona's user avatar
  • 313
1 vote
0 answers
165 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 ...
csheth's user avatar
  • 664
9 votes
2 answers
2k 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, ...
maycca's user avatar
  • 3,376
7 votes
1 answer
417 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 ...
Julia's user avatar
  • 71
8 votes
3 answers
3k views

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: ...
maycca's user avatar
  • 3,376