Questions tagged [modis]

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

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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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46 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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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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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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18 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 ...
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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. ...
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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 ...
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9 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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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 ...
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2answers
112 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 ...
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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 ...
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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
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 ...
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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 ...
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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: ...
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1answer
25 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 ...
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1answer
43 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/...
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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: ...
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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 ...
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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 ...
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30 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 ...
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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 ...
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59 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 ...
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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): ...
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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 ...
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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....
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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 ...
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1answer
95 views

Google Earth Engine Mask application

I'm using GEE in order to extract evapotranspiration (ET) data from MODIS (MOD16A2v6). I want to extract only ET band in order to make some further process. To do so, I apply some filters (like ...
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44 views

TIFF somewhat does not match with a shapefile

Two layers, one .shp and a NDVI image (from the MODIS, exported it in TIFF format from envi), have the same geographic coordinate system (GCS_WGS_1984), but they are not overlapping 100% in ArcGIS. ...
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1answer
39 views

Is the layer value of MODIS Day_view_time and Night_view_time in Local Time or in Local Solar Time?

On the NASA homepage in the layer description you can find following line for the Day_view_time layer: Does this mean that the layer contains the Local Time (LT) in the corresponding local time zone ...
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1answer
59 views

Why is this MODIS Output from Google Earth Engine Shifted?

I'm creating and saving the NDVI output of MOD13Q1 of a given district to Google Drive from Google Earth Engine. If I use the following code, the output tiff gets generated, but it is shifted about ...
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48 views

Smoothing MODIS LAI? [closed]

I am trying to smooth 8 days LAI data from MODIS and managed to work around it with several algorithms such as loess, Savitzky–Golay, smooth.spline etc. This is pretty much going well if the level of ...
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1answer
116 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 ...
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1answer
113 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 ...
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1answer
55 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/...
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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, ...
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1answer
36 views

Range value of raster data varies before and after mosaic implementation

I am trying to raster::mosaic bunch of .tif files extracted from hdf4 MODIS files. My script is working fine but I am puzzled by the range of raster values (min, max) before and after data processing. ...
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1answer
36 views

How to modify MODIS subset function to download product for a specific region and time period?

I am trying to assess the land cover change that has occurred over East Asia over last 18 years only in winters (Oct-Jan) for which I want to use MOD13Q1 dataset of modis from 2000-2018. I am using ...
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1answer
96 views

Getting 16 days composite in Google Earth Engine? [closed]

I've wrote this code. In this code I've call lst daily product. But I don't know how can I compute 16 days mean composite from daily product? code link: https://code.earthengine.google.com/...
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19 views

How to use the reducer.mean function to average multiple data points?

I am trying to figure out GDD over a period of multiple years given a period of time for each year, and the code provided below allows me to do that. Now that I have 10 years of data points, I am ...
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0answers
16 views

Geo-Referencing level 1 AQUA data

I have a direct broadcast AQUA data. I used RT-STPS to extract the level 0 .PDS files and process them further to level 1A and level 1B using the modisL1DB software. These produce .hdf files. I can ...
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1answer
49 views

Summing multiple image outputs in earth engine?

I am doing some GDD data analysis for a project and am having trouble coming up with a way to effectively analyze a specific time of the season over multiple years. What I am trying to do is find ...
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0answers
36 views

GEE: Different monthly result of ET with same dataset

The following code produces a graph with monthly ET from 2001-2015 over a region. https://code.earthengine.google.com/e832ebf5c6682669456a050d7c532e58 In contrast, when plotting the daily data, ...
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0answers
16 views

MODIS values too high after HDF4 to TIFF conversion

after converting MODIS NDVI and EVI (in HDF4 format) to tifs the values seem way too high (e.g. 2e+07), even after the multiplication with the scale factor (0.0001). As I can't access the data before ...
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0answers
49 views

Calculating MODIS 8-day composite GPP product as yearly [closed]

I want to use MODIS GPP 8-day composite product for an annual time series analysis. How to calculate the annual GPP from the 8-day composite? Since the fractions represent the daily average rates of ...
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0answers
91 views

R MODIS MOD13Q1 - How to handle data quality issues?

I'm running into some issues with 250m 16-day MOD13Q1 NDVI data using the MODIS package in R. Looking at the following raster plot, there are certain days where the NDVI does not match the true ...
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36 views

Using a MODIS code for DAYMET and I don't get any output

I am using the code below that was originally provided by @Kuik, and I have since converted the bands to DAYMET 'tmax' and 'tmin' bands. Problem is that when I run the code, I receive no output. ...
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1answer
54 views

Why is the difference between 005 and 006 versions of MOD13Q1 data?

I tried to repeat a project that used EVI in MOD13Q1. I failed and found that the project used the 005 version of MOD13Q1, and I can only download the 006 version on NASA's ftp. I compared the 005 ...
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1answer
63 views

Using accumulate function for temperature units?

I am working on a piece of code that is designed to aggregate growing degree days for a particular region. To start, the equation for growing degree days is: Daily GDD (°F) = Daily Average ...
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1answer
241 views

How big is a MODIS 250m pixel in reality?

How big is a MODIS 250m pixel in reality? This appears to be a question that contains its own answer, but I have several reasons to doubt that the pixel size is actually 250m x 250m: I downloaded ...