The Stack Overflow podcast is back! Listen to an interview with our new CEO.

Questions tagged [modis]

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

Filter by
Sorted by
Tagged with
0
votes
1answer
305 views

Chart Series By Region in Google Earth Engine?

I've wrote a code for modis ndvi timeseries(code below). But it returns error in chart creating (ui.Chart.image.seriesByRegion) : Error generating chart: Invalid argument specified for ee.Number(): ...
1
vote
2answers
776 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) ....
0
votes
1answer
229 views

How to calculate the Min & Max value for a pixel from multiple Raster Images?

I have downloaded a Bunch of MODIS MOD13Q1.006 Images for my Study Area, covering a period of 4 years (same scene across time). Now I want to calculate the Min & Max NDVI value for each Pixel, so ...
1
vote
0answers
13 views

Does Modis offer MultiYear statistics?

I'm trying to calculate the VCI data for my entire State. I'm using MODIS's 16 day NDVI Average. From this post, I see that I would need to calculate the Min & Max NDVI values for each pixel ...
0
votes
1answer
121 views

EVI2 value calculated from MODIS MOD09Q1 not bounded by -1 to 1

I'm trying to derive from MODIS 8 day composite MOD09Q1.006 product My formula follows the standard interpretation: EVI2 = 2.5(NIR-Red)/(NIR + 2.4*Red+1) I already know that MODIS bands for NIR ...
2
votes
1answer
381 views

MODIS downloads using Python

I am trying to get a full-functioning download script specifically for the Modis data (Version 6) on the USG/NASA site (AppEEARS/LPDAAC). I’m running Windows 10. I know that there is an R Modis ...
1
vote
1answer
157 views

Can't extract chlorophyll a values from NetCDF file using R

I'm trying to get the chlorophyll a values from a NetCDF file using R software, but all I'm getting are missing values, NA. I would like to know if I'm doing something wrong or if the file really just ...
2
votes
1answer
1k views

Export data from time-series image collection to a table in Google Earth Engine

On Google Earth Engine, I'd like to accomplish two tasks: extract data from every pixel, across a time-series, within the given geometry bounds and save it as a table. I need a column which prints ...
0
votes
1answer
74 views

Is the resolution of MYD13A2/MOD13A2 ( MODIS 16 day 1km Global Vegetation Indices) erroneous in Google Earth Engine?

The MODIS vegetation indices collection shows a resolution of 111319.4 metres in Google Earth Engine when, in fact, it should be 1000 metres. Below is my code: var Veg = ee.ImageCollection("MODIS/...
1
vote
1answer
312 views

Count pixels of different bands in MODIS

I need some help with my script in GEE. I’m working with a MODIS Terra Vegetation Continuous Fields Yearly (MOD44B.051 Terra Vegetation Continuous Fields Yearly Global 250m) and I’m trying to obtain ...
1
vote
1answer
2k views

Image collection to Single Image in Google Earth Engine

I'm stuck with an issue in google earth engine. I'm working with MODIS Burned Area Monthly Global 500m, for a certain polygon area: var MOD = ee.ImageCollection('MODIS/006/MCD64A1'); var MOD1 = MOD....
1
vote
0answers
141 views

Dimensions of images given their latitude and longitude for Google Earth Engine

From the point long: 16.499050771335575, lat: -30.882 I want to find the corresponding latitude and longitude values that would result in a 200 km by 200 km square in which the aforementioned ...
4
votes
3answers
1k views

Download MODIS/MCD19A2 AOD product with R

I'm looking for a programmatic way to download MODIS/MCD19A2 AOD data in R. So far, I've found a pretty solid R package called MODISTools that works nicely with the MODIS/VIIRS RESTful API. However, ...
1
vote
1answer
480 views

Extract raster values to CSV in Python

Attempting to gather MODIS aerosol data for a number of different AERONET stations in the UK to plot against one another. However, due to the number of files (upwards of 2000), QGIS and ArcMap crash. ...
0
votes
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?
1
vote
0answers
42 views

Opening MODIS Raster MOD13Q1 .hdf file comes in as Float32 instead of 16-bit signed integer

Trying to open a MODIS 16 day composite NDVI raster from the .hdf file. After selecting just the NDVI band, QGIS nicely displays the image. However, on this image the range of values is between -3....
0
votes
1answer
70 views

How Do I search for MODIS data using pyModis?

I want to download the latest Modis vegetation Index Data(MODIS/Terra Vegetation Indices 16-Day L3 Global 250m SIN Grid V006) , whenever it is available for my Study Area. I know the Tile that my ...
1
vote
1answer
55 views

Reducing monthly averaged MODIS data over several ROIs

I want to create monthly averages for the MODIS Land Surface Temperature (LST) product for several ROIs. I am able to create an image collection containing the monthly averaged MODIS data, but I have ...
3
votes
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
votes
1answer
89 views

Reclassify raster based on cell location and value

I am working in ArcGIS 10.5 (with the spatial analyst extension); I'm relatively inexperienced but I understand what I am trying to do, just need some help on how to accomplish it. I am working with ...
3
votes
1answer
984 views

Google earth engine:SST by month per year

I'm trying to plot a chart and get data from Google Earth Engine. I'm using MODIS-Aqua/L3SMI data in Earth Engine. I have used Earth Engines in built functions to compare average sea surface ...
-1
votes
1answer
182 views

What Python libraries can I use to georeference standard MODIS products?

I want to create georeferenced standard Swath MODIS products (for example, MOD02QKM hdf files) using Python. What Python libraries can do this?
1
vote
0answers
69 views

Creating Maximum-Value Composite of MODIS images using QGIS

I am trying to create a Maximum-Value composite of 4 MODIS images that are in .hdf format and I tried with 'Raster Composite' of ArcGIS but I think that's not the appropriate to do it. Can I do it ...
0
votes
0answers
76 views

MODIS LST maximum value composite

I am using eight day composite MODIS LST data MOD11A2. How do I make a monthly composite from four 8-day composite data taking the maximum value out of four in the output raster? Initially I went for ...
9
votes
1answer
940 views

Extracting values at specific latitude,longitude from MODIS swath data

I am trying to determine the amount of precipitable water vapor (PWV), ozone and aerosols as a function of time over specific spots on the Earth, namely our astronomical observatories. To do this, I'...
1
vote
1answer
107 views

MODIS 04_L2 projection transformation

Trying to extract MODIS Deep Blue Aerosols from a number of years. I have managed to open the HDF files in QGIS and ArcMap; however, have failed to reproject out of the sinusoidal grid so that the ...
1
vote
1answer
81 views

MODIS: MYD021KM data set - can't find radiance scales to convert SI to radiances

I would like to convert the scaled integers (SI) to radiances for all my SDS MYD021Km thermal emissive bands. In the MODIS Level 1B Product user guide on page 36 in section 5.5.1 it says: The ...
0
votes
1answer
69 views

Google Earth Engine: Same geometry different Areas (PERSIANN-MODIS)

I was trying to count the number of pixels that are inside my ROI and differs quite a lot one image from the other. For MODIS image I get a total of 265533 pixels (500x500) spatial resolution and ...
2
votes
1answer
299 views

ImageCollection Exporting by years

I am working with MODIS-NDVI data (MODIS/006/MOD13Q1) in Google Earth Engine. I have a script which exports each image in the image collection for given area and time period. I need to upgrade script ...
0
votes
1answer
274 views

Median image of merged image collections

Following this example I have merged 2 image collections to create a synthetic twice daily Aqua and Terra composite. Now I want to generate the median image of this combined collection. For a single ...
1
vote
1answer
171 views

Batch reprojecting large number of MODIS files

I am currently trying to reproject a large number (~14.000) of .hdf - files from MODIS Aqua/Terra from MODIS sinusoidal to something more popular (e.g. WGS1984). The files can be obtained from LAADS. ...
0
votes
1answer
335 views

Change pixel size of MODIS in GEE

I am trying to perform some scale-tests with some data on GEE. I have the following code where I use the MODIS-NDVI dataset at 500m. What I want to do, is to perform the same analysis but on 25000m x ...
1
vote
1answer
204 views

MODIS R Connection error

When i'm running my MODIS Download R script on my Windows, i'll get this error : ############################ Remote connection failed! Re-try: 49 Getting file from: LPDAAC #########################...
2
votes
0answers
47 views

Inaccurate alignment of MODIS HDF image (Dark Target product MYD04) [duplicate]

I have an issue with georeferencing of HDF files for the MYD04 product from MODIS (Dark Target Aerosol). A sample HDF file is given in the following link - https://www.dropbox.com/s/...
1
vote
0answers
42 views

How to Substract one image band from the subsequent in Google Earth Engine?

i am trying to find the day of year (doy) for each year with the highest change in NDVI compared to the day before, to map in the end a shift in start of season. My code to seperate each year so far (...
0
votes
1answer
285 views

Merging Aqua + Terra MODIS image collections

I run into an error when merging 2 image collections. Goal: I want to merge the (identical) 250m daily Terra and Aqua MODIS collections into one image collection to obtain one collection with 2 ...
0
votes
0answers
274 views

MODIS surface water and cloud shadow

I am trying to set up a daily water and cloud detection system and need to use a high temporal resolution. Therefore I intend on using daily MODIS imagery (MOD09GQ). In the water detection, cloud ...
0
votes
0answers
63 views

MODIS Landsat overlapping

I have two Lands Surface Temperature images, one from Landsat 7 and the other one is from MODIS, both for the same day. After projecting MODIS to UTM WGS84 the two images are slightly shifted, i.e. ...
2
votes
1answer
323 views

Troubleshooting downloading MODIS NDVI Data in R

I am trying to download MODIS Data from 2000-2018, however I am encountering some difficulties. Here is my script MODISoptions(localArcPath = "/Volumes/myserver/MODIS/data", ...
1
vote
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 ...
1
vote
1answer
87 views

MODIS getHdf : Error in .local(product, …) : Problems with online connections try a little later

I have a big problem today, i have this error while i'm executing my script : Error in .local(product, ...) : Problems with online connections try a little later My script : b1 <- getHdf(...
1
vote
0answers
261 views

Add a list of dates as an image properties in Google Earth Engine? [closed]

I've merged two image collections after calculating median values by month in each collection from 2000 to 2018. However I need to carry out an operation that needs the "sytem:time.start" field that ...
0
votes
1answer
729 views

Google Earth Engine: How to calculate regular day interval means in image collections, maintaining “system:time.start” field?

I've merged three Landsat collections in Google Earth Engine, now I need to calculate median values at regular time intervals, let's say 32 days, because I will create a collection to join with MODIS. ...
-1
votes
1answer
110 views

Error in .getModisList(x = xx, h = h, v = v, dates = dates, opt = opt, : No available data for the selected dates

I have a problem using ModisDownload from RTS Package on R, i always have the same error using ModisDownload or getMODIS functions : Error in .getModisList(x = xx, h = h, v = v, dates = dates, opt = ...
0
votes
0answers
27 views

GRASSGIS Batch Process Command Not Running

I'm trying to rescale MODIS LST data by running the following command but it gives this error (Image Attached) Kindly help if the syntax is not right. Command: for %i (*MOD11A1.A2000065.LST_Day_1km*...
1
vote
1answer
262 views

LST MODIS harmonic fitting in Google Earth Engine - Predicting Future Scenarios?

I've been working on code for harmonic fitting of MODIS LST data. The code is working fine; however I would like to create future LST images in future dates by using the "fitting" band. Thus, I would ...
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 (...
3
votes
1answer
478 views

Cloudless days count with MODIS in Google Earth Engine

I'm trying to estimate the total of clear days in a year with the help of state_1km band in the MOD09GA product. But I'm not sure if it is right, also the possible counts are higher than expected when ...
0
votes
1answer
185 views

Seasonal analysis in Google Earth Engine

I want to perform a seasonal analysis of the MODIS NDVI dataset in GEE. I want to analyse for every year the months from May to September and thus, I need to remove the rest of the months from the ...
1
vote
1answer
286 views

DOY chart in Google Earth Engine

With the following code I am trying to produce a NDVI graph with the days of the year on the x axis (based on this example, 2nd graph). var modisNDVI = ee.ImageCollection ('MODIS/MCD43A4_006_NDVI'); ...