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Questions tagged [modis]

Questions about data from the Moderate-Resolution Imaging Spectroradiometer sensors aboard the Terra and Aqua satellites.

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8 views

How to sum GDD for a specific date range over multiple years?

I have written a basic code that can sum GDD for a specific date range for a single year as seen below: var dataset = ee.ImageCollection('MODIS/006/MYD11A1') .filter(ee.Filter.date(...
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2answers
50 views

Convenient way to download MCD19A2 product using R

I want to download MODIS MCDA219 product. I have been downloading manually from https://ladsweb.modaps.eosdis.nasa.gov/ and https://earthdata.nasa.gov . As a new to R user, recently I have learn ...
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1answer
217 views

Get a mask for MODIS (250m, MOD09GQ) using MODIS (500m, MOD09GA) in Google Earth Engine?

How can I use the quality information stored in MODIS (500m) to create a mask for my MODIS (250m) image - e.g. cloud mask? When I merged the two image collections and run a function to detect the ...
1
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1answer
188 views

Is MODIS sinusoidal tile boundary in Eathdata website real?

I was using MOIDS data MCD12Q1 (MODIS/Terra+Aqua Land Cover Type Yearly L3 Global 500m SIN Grid V00). I try to use PyProj in Python to transform the Sinusoidal projection to lat/lon. It actually ...
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1answer
47 views

Creating NDVI time series from single polygon of shapefile using Google Earth Engine

I am new in Google Earth Engine, I am trying to plot ndvi timeseries from a single polygon of shapefile, but when I run the code I get "Error generating chart: Collection query aborted after ...
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0answers
7 views

Filter collection with millis data on MODIS

I'm trying to split a modis collection in two others, using like a splitter a data time that's defined in millis. I don't want to do it manually. var maskMOD13Q1 = function(image) { var qa = image....
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1answer
24 views

Merging multiple satellite bands for science data set rasters?

I am using MODIS satellite imagery data for one specific derived band. The problem I am running into is that it is a MCD19 SDS layer, which contains different bands for each orbit overpass at a ...
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0answers
8 views

Calculating LST from MODIS Google Earth Engine? [duplicate]

How do I calculate Land Surface Temperature from MODIS in Google Earth Engine? I don't want to use the available products because I want to do it manaully. Which dataset should I select that has ...
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0answers
26 views

MODIS DAAC2Disk fails with “Unable to obtain ECHO token”

I have been using the tool DAAC2Disk to easily download NDVI using an extent. However recently the tool fails with the error: "Unable to obtain ECHO token" Has anyone encountered such error? Or know ...
4
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1answer
1k views

R package gapfill: How to convert R raster stack to 4-dimensional array and then back to raster stack?

I'm currently analyzing MODIS EVI time series (MOD13Q1) for a small region between 2000 and 2015. Now, I would like to fill missing values using the new R package gapfill. What I have done so far: ...
3
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1answer
2k views

Earth Engine memory capacity exceeded

I want to generate time-series MODIS images of a small area (10x10km) via Google Earth Engine from 2000 to 2017. I generate the clipped image collection easily and then export each image individually ...
0
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1answer
58 views

Using MODIS metadata in R

I am working with MODIS 1b Data in R, and converted the HDF files into tiffs. They load and plot correctly. I am now trying to convert the values of corrected_counts_scale and ...
4
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1answer
283 views

Getting tile number of sinusoidal MODIS product from lat/long?

I'm using this tool to get the tile number (horizontal/vertical) from lat/long. Is there any code,preferably python, to get the tile number ? I tried using this tool. But it gives wrong tile number. ...
0
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1answer
28 views

Is re-gridding a good idea?

I am working with MODIS Aerosol data (the Level-2 AOD_550_Dark_Target_Deep_Blue_Combined product). I am retrieving the data using the LAADS DAAC data API, and requesting all swaths as GeoTIFF files. ...
0
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1answer
29 views

Geolocation of L2G-Lite MODIS data

I would like to know if I am processing an L2G-Lite MODIS product, do I still need to geolocate, or reproject it to EPSG:4326? Or can I just leave it?
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0answers
18 views

GEE: resampling MODIS LST from 1km to 200km produces gradient

I am trying to resample raster from 1km resolution to 200m using this code: var august = ee.ImageCollection(landsat) .filterDate('2019-08-01', '2019-08-30') .filterBounds(geometry); //Mean ...
4
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1answer
111 views

MODIS Fire Product tile conversion to GeoTIFF problem

I downloaded a tile (selected tile in the picture) from https://ladsweb.modaps.eosdis.nasa.gov/search/order/3/MOD14--6/2019-08-09/DB/Tile:H25V6 I used gdalinfo on the file. It's output is Driver: ...
0
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0answers
10 views

Difference between local and global image co-registration

I want to co-register Landsat and Modis image after Reprojection and Resampling. So for that I was trying to understand the difference between local and global image co-registration of this library. ...
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0answers
17 views

Masking Landsat-8 and Modis (Aqua) with same shape file doesn't result in same shape

I was trying to mask Landsat-8 and Modis (Aqua image). FYI, I have converted the MODIS image to the same projection as Landsat and same resolution as 30m. Finally once i am done with masking using ...
2
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1answer
151 views

Which output data type to choose in QGIS SAGA Raster Calculator in Batch Mode?

I have 5 years of MODIS13Q1 NDVI .tiff images for time series analysis. I want to multiply all the images with the scale factor of 0.0001 before using them. In order to process all at once I try to ...
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2answers
113 views

Resampling 1000m resolution Aqua MODIS images to 30m resolution

I am trying to resample the MODIS (aqua) image from 1000m resolution to LandSat image resolution which is of 30m for applying ESTARTFM technique. So you need to do preprocessing (Resampling and ...
1
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1answer
5k views

Creating raster stack using R?

I have 300 .tiff files, that i need to create raster stack of them. Can you please help me with R code for that? I can do in Arcgis, Envi, R. I have tried: setwd("F:\\MODIS\\Modis EVI\\HDF8 EVI") ...
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0answers
22 views

Google Earth Engine: calculate number of weeks where SST over a threshold in past 12 weeks

I've been using the MODIS-Aqua/L3SMI dataset to investigate sea surface temperatures (SST) for a specific region. What I'd like to do is for a specific time epriod (could be day, week or month), find ...
0
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1answer
25 views

My NDVI values are way out of range - GEE

I am supposed to collect NDVI values for some states in the USA. I understand NDVI is supposed to be between -1 and 1, but my values are in the 1000s. Can someone please help me with the ...
1
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0answers
14 views

Problem merging/clipping MODIS rasters in QGIS

Im pretty new to QGIS and am having some trouble making a NDVI map for Mali. To cover the whole country I need 5 MODIS NDVI tiles, however every time I try to merge them I get a "the following layers ...
-5
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1answer
26 views

Getting Automatic MODIS HDF Files 2003-2018 by Shell Script [closed]

#!/bin/bash # This Script is for getting Automatic HDF Files # Product MODIS MYD11A2 Data From web https://e4ftl01.cr.usgs.gov/ # Change Login And Passwords User registred on Earthdata # This ...
3
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1answer
665 views

Converting HDF file (MODIS product) in ArcGIS as correctly georeferenced raster by ENVI?

Which algorithm I should use in ENVI 5.2 to open the MODIS product (MOD13Q1 or MODIS/Terra Vegetation Indices 16-Day L3 Global 250m Grid SIN V006), given as HDF file to ArcGIS 10.5 as correctly ...
3
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1answer
44 views

Problems with analyzing MODIS Aerosol Optical Depth

I want to extract AOD from the following hd5 file.Would be grateful for any help. Objective is to have a tif file projected in EPSG:4326 with values of all 3 bands. https://e4ftl01.cr.usgs.gov/MOTA/...
7
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1answer
326 views

Opening MOD17A3 in ENVI so it is properly georeferenced?

I am using ENVI 5.1 on Windows 8. I am trying to open a MOD17A3 (MODIS Net Primary Productivity standard product - L4) .hdf file which I downloaded from the USGS website. I am still a beginner at ENVI,...
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0answers
28 views

Monthly Water Area Monitoring in Google Earth Engine?

I've computed water area for each 8 days for about 20 years. I don't know how can I compute monthly area for these years? or How can I change 8 days product to the monthly in this code? code link: ...
1
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1answer
90 views

Whether Sentinel 3 OLCI can be used as a MODIS replacement for 250m NDVI?

Based on the bandwidths MODIS bands 1 and 2 (620nm - 876nm) will match S3 bands Oa7 - Oa17 (620nm - 865nm) I am just trying to know if anyone had any experience in using S3 data instead of MODIS for ...
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0answers
14 views

Correcting an inaccurate edge effect on MODIS L2 swath data?

I am currently trying to process a MODIS MOD10_L2 product (Snow Cover 5-Min L2 Swath 500m, Version 6) to extract snow cover information. It's in HDF-EOS format and I process it with GDAL in Python and ...
0
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1answer
19 views

Read only a specific value in LC_Type1 Class Table for MCD12Q1.006 MODIS Land Cover Type Yearly Global 500m

I have defined a specific area to look at but now I want to only read the data for the water. MCD12Q1.006 MODIS Land Cover Type Yearly Global 500m has a LC_Type1 Class Table and I only want to read ...
3
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2answers
561 views

Using Quality Control process for MODIS Leaf Area Index?

Anyone can help in explaining how I can apply Quality Control (QC) for MODIS Leaf Area Index (LAI) to extract the valid pixels of LAI using ArcMap?
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0answers
11 views

Calculate per pixel Landsat Relative Azimuth Angle (RAA)

Iam Trying to Generate Landsat-8/OLI NBAR images. Given that USGS Landsat-8 Angtool can generate per pixel view_zenith, view_azimuth, sun_zenith and sun_azimuth angle bands. Is Relative Azimuth Angle ...
0
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0answers
31 views

Calculate per pixel Sentinel-2 Solar and Sensor Angle Views

I am working with Sentinel-2 images and would like to generate per pixel angle bands (view_zenith, view_azimuth, sun_zenith and sun_azimuth). Considering Sentinel-2 SAFE structure, I found that ...
0
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1answer
118 views

Using BFAST Spatial algorithm in R?

I have 65 monthly MOD11A2 (LST) images. The images came from the average of the original 8 day products. I have made them a time series stack using the timeStackMODIS function of the bfastSpatial ...
1
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1answer
57 views

Creating heat map animation based on point-shapefile with data attribute in ArcGIS [closed]

I want to create an animation of forest fires, using the NASA' MODIS data for the last 11 years. Their shapefile has acquisition data attribute — and it goes day by day all those years. I've already ...
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0answers
20 views

Scaling factor for MODIS (MY09GA 006 or MYDTBGA 006) product for timeseries data

I was using Modis data (MYDO9GA) product for my research and I was following this document as a user guide. https://landweb.modaps.eosdis.nasa.gov/QA_WWW/forPage/user_guide/MOD09_UserGuide_v1.4.pdf ...
7
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1answer
6k views

Reprojected MODIS NDVI has range from -32768 to 32767, expected -1 to 1

I'm new to StackExchange and to remote sensing. I am working with MOD13Q1 250m 16-day MVCs. My goal is to use NDVI time-series to classify cropping pattern and crop type, then link this data to ...
0
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0answers
64 views

Export coordinates' values over a rectangle on Google Earth Engine

I am currently trying to export coordinates (and their values) of MODIS Aqua daily hotspot dataset for one month (November 2018). My idea is selecting a region using a rectangle geometry of the image ...
1
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2answers
54 views

stack() in R does not include all .tiff files in my directory

I am trying to perform stack() in R using enhanced vegetation index (EVI) time-series maps but it doesn't include all the .tiff files in my directory. Here's the list of files when I dir(files.evi): ...
1
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2answers
771 views

Making stack from many images in Google Earth Engine?

Using the code below, I've computed 20 ndvi images for modis data. How can I stack and save them in a single file? var mod13 = ee.ImageCollection("MODIS/006/MOD13Q1") .filterBounds(geometry) ....
3
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1answer
150 views

MODIS L1B reprojection and mosaic problem

I have been using MODIS L1B file to retrieve water vapor content. However, my study area is exactly between the gap between two images,just like this: I have tries ENVI MCTK extensions, HEG TOOLS, ...
0
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0answers
52 views

runGdal returns “gdalinfo failed - unable to open” […] “.hdf” file

I'm trying to use the function runGdalin R on a Mac and it seems that gdalinfo is not able to open the file. In the terminal, when I entered gdalinfo /MODIS/MCD12Q1.006/2009.01.01/MCD12Q1.A2009001....
0
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1answer
68 views

Get maximum pixel value within numeric range

I am working with MODIS Global Primary Production (GPP) rasters and I am trying to pick the max GPP pixel value in a series of 15 dates for a study area and create a new raster layer. MODIS GPP ...
0
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1answer
118 views

MODIS HDF file without Coordinate System?

I am using the MOD04_L2 MODIS Aerosol Deep Blue product from the LAADS API. These files are in hdf4 format, but I am transforming them to hdf5. I did transform the files because I'm unable to compile ...
0
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1answer
57 views

Make a loop in Google Earth Engine for reduce NDVI from year a months?

I have this code, it generate N ImageCollection and for each image a chart from NDVI in function a the months This is the place of study: var areaEst = ee.FeatureCollection("users/aleszczuk/...
1
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1answer
157 views

Creating loop in Google Earth Engine?

I have written a code that is taking data from MODIS about NDVI, filter for March only , calculates the mean value for the whole month and clip it with geometry. The NDVI data is for period of years, ...
5
votes
1answer
166 views

Understanding measurement units for MODIS data?

I am working on MODIS data in ESA SNAP, specifically the Terra sensor, and I'm having a hard time understanding the unit of measurement of the data provided. I have downloaded Level 1B data (...