Free digital terrain model (DEM) on the web

More Mohamed El Mehdi Saidi's questions See All

Longer and longer wait time to render a publication decision ?

Given the longer and longer wait time to give the first decision to accept or not a paper (by the editors), I would like to ask you : As a reviewer, how long do you usually take to examine a...

02 March 2019 7,738 4 View

Why do the letter "Q" symbolize stream discharge?

Why do we usually use the letter "Q" to symbolize stream discharge? is it used in other sciences such as thermodynamics or fluid dynamics ... ? thank you.

09 October 2017 9,928 11 View

Solar noon and equation of time ?

Solar noon, which indicates the moment when the sun crosses the meridian and when it's at its highest elevation in the sky, at 12 o'clock apparent solar time, does not occur every day at the same...

07 August 2015 8,072 0 View

Is There Any Feasible Method To Test Fluorescent Compounds Other Than Fluorescence Spectrometers ??

Is There Any Feasible Method To Test The Efficiency Of Fluorescent Compounds Other Than UV Spectrometers ? Suggestions Would Be Appreciated !

02 March 2021 5,785 3 View

Which SAR dataset to use for generating coherency matrix and performing target decomposition (Description) ?

Working on chandrayaan-2 DFSAR data, there are three datasets available: 1) Slant range image data product: The slant range complex image file. Each pixel is represented by two 4-byte floating...

02 March 2021 8,481 3 View

How UAV or drone can be beneficial to better estimate crop yield?

As we know, crop yield estimation has been done traditionally with farmer's expert knowledge, deductive sampling in representative areas, and remote sensing with satellite imagery. Farmer's Expert...

01 March 2021 3,468 3 View

Which bacteria are suitable for quorum sensing screening?

I want to find a quorum sensing inhibitor from plant extracts. Klebsiella pneumoniae, Moraxella catarrhalis, Staphylococcus aureus, and Streptococcus pneumoniae. I looked for these strains...

01 March 2021 7,675 3 View

What is your preference for journals for publishing in the field of Hyperspectral Imaging or Remote sensing?

I believe that we need to share our experience in publishing in the field of Hyperspectral Imaging or remote sensing? What is the best journal that you publish with? What is the worst experience...

23 February 2021 3,411 4 View

How to use Remote sensing and GIS applications for mapping the available medicinal plants within the locality/municipality?

Hello, I'm very interested in mapping and managing the conservation of the Philippine traditional medicinal plants, in which I think is very helpful in the field of medicine for further analysis...

21 February 2021 374 5 View

How to discriminate between Sentinel-2 Level-2A Product Discriminators?

According to the Sentinel-2 user guide here (https://sentinel.esa.int/web/sentinel/user-guides/sentinel-2-msi/naming-convention), the compact naming convention is arranged as...

21 February 2021 5,919 9 View

Is the box plot of climatic indices better illustrate from daily data or annual data?

Hello, I hope you have a good time. I work on a research project about temperature indices. Due to the high number of indices, I only work on tables and maps on an annual time scale. In other...

19 February 2021 9,742 2 View

What are the options for global scale hydrology DEM?

Hello, I am working on a global scale hydrology GIS project delineating global watersheds and doing some data analysis. I have in the past used hydro1K from the USGS that cover the entire world....

18 February 2021 5,109 5 View

Are cloud points able to identify tree species?

Hello Dears My goal is to classify dense forest tree species using drone images. Is it possible to classify dense cloud points? If yes, in what way and in what software? Thankful

15 February 2021 3,475 3 View

Wendy Peterman

This site has a 15m DEM: http://orthocoverage.tti.fr/download/morocco1.php

NASA just seems to have 30 m: http://asterweb.jpl.nasa.gov/gdem.asp

Mohamed El Mehdi Saidi

actually it is 15 m. Thank you very much. for ESRI ArcGIS, I think we should use GeoTIFF for hydrologic study of the watershed ?

Actually, if you download the ASCII file, you can convert it into a raster, and that will be the best to use in ArcGIS.

Wilson V.C. Wong

It would be possible by resampling the DEM to higher resolution (e.g. 1m) using cubic convolution or bilinear interpolation technique. In our study for tropical montane forest, the accuracy was maintained when we resampled the DEM to 1m, 2m and 5m of spatial resolution (SD=9.0m-10.4m; RMSE=9.3m-10.6m).

Conference Paper Accuracy assessment of global topographic data (SRTM & ASTER...