23 Questions 23 Answers 0 Followers
Questions related from Zainab Khan
Dear colleagues, I am working on fusing MODIS NDVI with Landsat NDVI for the same region and date. I have already reprojected the MODIS rasters using .rio.reproject_match() from rioxarray to...
23 July 2025 3,717 1 View
I am observing a checkerboard pattern when processing slope from the Copernicus 30m DEM. I have accurately calculated the Z-factor for my region, and I have attempted the analysis using R, ArcGIS...
31 May 2025 4,260 3 View
I am using L08 and 09 dataset band is ST_B10, or band 10 for thermal data, I got this formula from many places that states "LST =ST_B10 × 0.00341802 + 149.0", is this correct? The confusion arose...
24 May 2025 2,696 3 View
Dear fellows! I have running Apparent reflectence function of ArcGIS Pro. Are these results correct? I there are no pixels but kind of polygons. I am confused if my results are correct. Please...
13 March 2024 1,456 3 View
Dear fellow researchers! I need global data on normalised difference moisture index (NDMI) in raster formats. Is it possible to get it? The AOI is considerably large and going for calculation...
27 August 2023 7,699 2 View
Can anyone tell definitional difference between DTM (digital terrain model) and DEM(digital elevation model)? Please answer.
02 August 2023 6,001 2 View
Dear researchers! I have rasters, one with zero values and other with 1 both of them are overlying and pertain same pixel size but have have different extant. Can someone please help me how to...
11 June 2023 8,267 2 View
Hello everyone! I was working on light pollution and nighttime images lately and someone suggested me to use Otsu's thresholding method. I understand the basic idea and calculation of Otsu's...
22 March 2023 8,500 0 View
Dear Botanists and ecologists! Attached picture represents a submered plant species of freshwater Himalayan lakes occurring at an altitude of 1800-2000 meters. The plant survives under water....
04 November 2022 1,642 5 View
Hello all, I have SpatialPointsDataFrame object loaded in R studio, with units in meters. I need to convert the units into degree decimals. HOw can I do that? Someone please help with codes.
15 May 2022 7,977 3 View
Dear Researchers! I calculated the values of CCA, with 7 environmenta variables (independent) and 15 species (dependet variables), three different sites. The results are there in graphical form....
27 April 2022 7,324 3 View
Dear all! I am calculating some biodiversity indices for understanding a given ecosystem. Can I state these biodiversity indices as bio-indicator? Thank you in advance!
21 April 2022 473 8 View
Dear All! I need freely accessible station-wise rainfall data for the state of Uttarakhand from 2001 to 2020... Is there any portal that provide free data?
28 July 2021 5,705 3 View
Dear All! I'm creating a service area but atis Point 'A' and point 'B', the polygon of service area in indented which even visually can be concluded wrong. THis area should extend till green...
16 June 2021 4,611 8 View
In continuous raster which is not DEM, there are gaps having NoData values ( please do not confuse it with Null values) that need to get removed. I specifically want to get rid of them by filling...
22 March 2021 8,356 4 View
I'm suffering so much when downloading the sentinel-2 as wall as sentinel-1 data, have tried different browsers and portals like ASF, ED and USGS. but the speed is too slow and n m getting error...
19 September 2019 3,776 0 View
I need to assess the impact of various spatially distributed factors(explanatory variables) on a particular feature (dependent variable) having the same spatial attribute. Can I do this using OLS...
08 April 2019 4,519 4 View
I layerstacked the data in ERDAS with all the 11 bands, the image is poorly distinguishable. I m lacking the knowledge to use it for extraction of information about various light sources? Please...
07 April 2019 1,336 0 View
M looking for free access of Lidar data set of Kumaun region, Uttarakhand, India, is it freely available at any portal?
18 March 2019 5,326 3 View
I need to understand the trend of biodiversity richness together with other parameters of the ecosystem.
06 February 2019 860 4 View
Hi everyone! Does anyone have any idea why sentinel-1 B dataset is offline at copernicus open access hub? is it discontinued? Please mention if it is available in some other repository. Thanks...
01 January 1970 6,244 0 View
Hi everyone! where can I get spatial data for rock types, detailed map, shapefiles, gridded data, anything will do for me. I need Global Data. Please share some links. Thank you!
01 January 1970 4,014 3 View
Hello everyone! I'm currently working on a time series of vegetation indices, and a key question I have is which method of atmospheric correction to use. Is it absolutely crucial for achieving...
01 January 1970 4,576 1 View
