Nikolaos Tziokas

11 Questions 25 Answers 0 Followers

Questions related from Nikolaos Tziokas

How to export daily image from PROBA-V using Google Earth Engine?

I'm trying to download single NDVI image from Proba-V. Proba-V produces images every 2 days. Here (https://developers.google.com/earth-engine/datasets/catalog/VITO_PROBAV_C1_S1_TOC_100M) is the...

30 May 2023 8,027 2 View

Black Marble nighttime lights imagery in Google Earth Engine?

I want to download Black Marble daily nighttime lights (NTL) using Google Earth Engine (GEE). My question is if the pixel values of the images are in digital numbers (DN) or radiance. Here is a...

22 May 2023 714 4 View

How to download yearly MODIS NDVI 16 day 250m using Google Earth Engine?

I am trying to export yearly median MODIS-based NDVI products at 250m spatial resolution. I am using the 16 day MODIS/061/MOD13Q1 product. I have found this code which I am following...

26 January 2023 3,909 4 View

How to extract GWR coefficients and apply them to a finer spatial scale?

I have three raster layers, two coarse resolution and one fine resolution. My goal is to extract GWR's coefficients (intercept and slope) and apply them to my fine resolution raster. I can do this...

03 December 2022 2,675 1 View

Should label the samples when downscaling reflectance using a deep learning approach?

I want to downscale a satellite image using a deep learning approach, called extended super-resolution convolutional neural network (ESRCNN). The paper of the method is 'Deep learning-based fusion...

15 October 2022 9,244 2 View

Why during CoKriging interpolation infinities are created inside the study area?

I am utilizing Area-to-Area CoKriging (AtACoK) for raster downscaling in R using the atakrig package. For this purpose I have one dependent variable (let's say x) with pixel size of 400m and 2...

18 February 2022 3,843 7 View

VGG classification of satellite images - How to to label your samples?

Hi, I am new to DL and I'm trying to classify 1 Landsat8 image into 3 categories using VGG-19. I am using 8 bands (B2 to B7 ,B10 and Panchromatic). I performed the sampling procedure and my...

12 September 2021 3,855 3 View

How to select sample size for the VGG-16 architecture?

Dear all, My goal is to predict night light intensity based on day time satellite imagery. I am using data from VIIRS and Landsat 8 sensors. My study area is shown in the attached image and I am...

23 June 2021 5,056 3 View

Yearly socioeconomic raster data for India

Hi, I was wondering if there are yearly socioeconomic spatial data for India (e.g. population distribution, energy consumption) for the period 2013-today. So far, i managed to find population...

01 January 1970 7,411 8 View

Which cities are considered global cities?

I am looking for a list of global cities. By global city I mean "Global cities are major “corporate and financial hubs” in a “global web of linkages”, based on the functional perspective in urban...

01 January 1970 3,829 12 View

Tree Cover Density raster layer: is it considered a categorical raster?

This might be a silly question but I got confussed. I am using the Tree Cover Density (TCD) raster layer from EEA...

01 January 1970 8,268 2 View