Google Earth Engine 7: Exporting Raster and Vector Data 

Thank you! feedback is much appreciated

This made my day 🤗! Good luck with the internship!

@@ProgramSam Thank you sir.

I was wondering how do label satellite data in various tasks like predicting forest area, economic well-being etc. Can you please share insights on such scenarios.

hah! You got me there 😉. You are very welcome! It makes me happy to hear that I can share the experience.

Thank you for the feedback! The only thing I can think of is that you didn't select the right color bands? So the export video function requires the image collection to only contain images with three bands (corresponding to RGB). Have you made sure you have selected the correct bands?

me too bro...i can export them but theres nothing in them

same question here, could you solve it?

Yes that is certainly possible. the Export.table should work with polygons as well. You can find more information about this function here: developers.google.com/earth-engine/guides/exporting#exporting-tables-and-vector-data

If you export it to your drive to download it, you are indeed limited by the volume of your Google drive. You can also save your result to Assets, to be used in the GEE again. I don't think that adds to your drive volume.

I haven't used the TFRecords export myself that much, but could it be the 'PatchDimensions' that this documentation pages talks about? developers.google.com/earth-engine/guides/tfrecord#formatoptions

So in other words, what you want to do is iterate over the points from your Fusion table, extract the image value of band 2 and 3, and store it as a feature so you can export it as a table? Maybe this stackExchange question is able to help you: gis.stackexchange.com/questions/265392/extracting-pixel-values-by-points-and-converting-to-table-in-google-earth-engine/265618 The solution is to define a function that you can map over your feature collection (features from fusion table). This function uses reduceRegion function which reduces the image based on a region (aka get the value at the point). Then it creates a new feature with the initial point information and the new reduceRegion information. These feature then form a new featureCollection you can export according to my video (at 13:35). I hope this can get you started. If you're stuck feel free to stop by again!

@@ProgramSam Thanks for reply. I have managed to do it using sampleRegion function. Thanks for your Vidoes, they really help.

Have you tried changing the option 'fileDimensions'? This determines how large a file can get. by increasing this you might be able to store everything in one image

I used this: var huggies = hough.reduceToVectors({ reducer: ee.Reducer.mean(), geometry: rectangle, scale: 30 }); It worked but I guess the scale parameter needs to be adjusted.

@@batuhankavlak what is "hough" on your code?

There is no option to download a file directly to your computer. The only way currently is to save it to google drive and download it from there.

The GeoTIFF file format stores all bands of the GEE Image. If you have appropriate software to visualize it (such as QGIS) You should be able to use it.

Is the variable that you try to export a single image or an image collection? Another thing that might be an issue: When you export an image you should also check if the bands are in the same datatype. The bands in Landsat images are usually floats, but there is one band, BQA (bitmask) that is a double. If this would be the issue, you could try to resolve it by a line such as "image = image.toFloat()" or something similar.

@@ProgramSam can i contact you personally?

thats what i want as well.lol..ive been searching for a while now

Hi! Sorry for my late reply, I hope I can still be of help. Everything mentioned in the video should work for DEM's as well. Just find the DEM you need, merge it into one image if needed with either .mosaic, .min, .max, .mean... And follow the steps to export it to your Drive.

You can use Earth Engine Explorer. See example ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ba_F1cJpCAU.html

I don't think you can export imageCollections. Images you can, featureCollections as well, but not imageCollection. I think they don't allow this because image collections can have massive storage sizes.

That's a common error but it also tells you what is wrong. So you want to clip an image, but you did not pass in one image, you passed in an ImageCollection. So what you need to do is convert this collection of images (even if the collection only contains one image) to an Image. This can be done in many ways, you can simply take the first one, with the ImageCollection.first() function, or you can take the median value of all images in the collection with the ImageCollection.median() function. And there are a few more functions you can explore :) .

Tnx 4 d respond

The error already tells you what might be wrong. So to export data you need an image, but the variable you seemed to export is an ImageCollection, a collection of images. Even if there is only one image in the collection, the variable is still an ImageCollection. To turn an ImageCollection variable into an Image variable you could take variablename.first(). This will take the first image from the collection. if your collection has multiple images you could also take variablename.mean(), or variablename.max() to group all images from the collection to one new image.

@@ProgramSam I have the same issue and I undestand that the export functions expect an image and not an image collection. But I want to export all images in my filtered collection as in to work with them as a raster brick in R for example. Do you know how?

yes, you can export tables to SHP format, try Export.table.toDrive and add a "fileFormat: 'SHP'"

@ thank you so much. i will try..

Can you more explain what data you have, are they raster, vector... and what you would like to export? Is it a part of an image, multiple layers... I'm not entirely getting what you are trying to achieve.

​@@ProgramSam Thank you sir for reply sir actually i am exporting raster image.My study area is consist of 3 tiles of Landsat images. i classified the Composite image, i want to export it to drive.

Layer

If you want to export the 3 tiles You will probably want to merge them first by using the .mosaic() function or the mean/max/min... functions. Then for both the merged result, and the classified image (if it is a raster) you can use the export.image.todrive as explained in the video

@@ProgramSam Thank you

It should be possible! But since the export to video function requires 3 bands representing red green and blue, you might want to add an empty band to represent blue.

@@ProgramSam Thanks

Indeed, exporting only exports the data and not the visualization you gave it in the GEE. Have you tried styling the data in QGIS?

@@ProgramSam NDVI is from -1 to 1. I have tried different methods in exporting but when open on QGIS it only exported a single pixel (0.4) for the whole spectrum, thereby making it black. What should I do?

Then maybe check your export settings. Especially the scale. Perhaps the scale is so large, that your entire image is exported as one pixel. And that pixel then has a value of 0.4.If this is the issue, reducing the scale (amount of meters/unit per pixel) can give you an image with a resolution larger than 1 pixel.

@@ProgramSam After reducing the scale to like 5, it still downloaded 1.34kb image

@@olamiposicalebfagunloye594 hmm could you share a link to your code?

Those imports and what else you mention are explained in previous videos as this video only explains the export functionality. Watching the second video on filtering and displaying data (ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-4w6Mt6HTC2I.html) should help you a lot. You can check all importable datasets here (developers.google.com/earth-engine/datasets) to see if there is one that suits you, filter that for your location and then export it using this video. It should be able to follow the examples in the videos and simply use your region of interest and preferred datasets without having to understand every piece of code. Hope it helps!

@@ProgramSam Thanks for replying. I'll see if I can find what I need (if I'm accepted as a developer, whom I'm not, as I need access only for a hobby). However, I don't know how accurate those datasets are. Maybe they're very inaccurate, so 30 meters in all axes, which would render them useless for me. I'd like to import terrain data from Google Earth, which is extremely accurate. Do you know if it's possible?