ASTER Satellite Imagery QGIS. Oil Spectral Signature. Part 1.

i'm a hydrogeologist my model in life is think out of the box my name marcel my experience ground water and soil contaminations i'm the creator of jlrgb a channel of geographic information systems gis geology hydrogeology and contamination the purpose the objective the goal the intention the target the desire share my experience and acknowledge to create eight points of discussion the jail rtb community promote the use of free and open source software a free digital society provide technical advice to environmental companies an opportunity for professional growth all rain on burnaby at 12 31 pm on july 24 2007 an excavator accidentally structured a crew oil pipeline in burnaby british columbia canada they all spread the area for approximately 25 minutes before the flow was stopped approximately 250 000 liters of crude oil was spilled about 7 000 liters of oil entered the stone drain system and eventually reached the waters of warren [Music] island [Music] [Music] [Music] [Music] hello guys and welcome back to my channel today we are going to work with former satellite images from the terra satellite captured in 2007 by the sensor astor there are satellite images related to the oil spill occurred in 2007 in burnaby we are going to see how we can get these satellite images for free how we can process the images using an open source and three software in this case is going to be quantum gis and also we are going to analyze the spectral signatures related to the oil spill first let's go to talk a little bit about the aster the advanced spaceborne thermal emission and reflection radiometer aster is a japanese sensor which is one of the five remote sensory device on board the terra satellite launched into earth orbit by nasa in 1999 the instrument has been collating data since february 2000 aster provides high-resolution images of the planet earth in 14 different bands of the electromagnetic spectrum ranging from the visible to the thermal infrared light the resolution of the images ranges between 15 and 90 meters aster data are used to create the tile maps of the surface temperature of the land emissibility reflectance and elevation for today lesson we are going to use just the data related with the reflectance but be aware that aster is also a good resource for the creation of digital elevation models in april 2008 the swi earth detectors of astor began malfunction and were publicly declared non-operational by nasa in january 2009 all swi earth data collected after first april 2008 has been marked as unusable the aster global digital elevation model gdem is available at no charge to users worldwide via electronic download as of 2nd april 2016 the entire catalog of aster image data became publicly available online at not cost it can be downloaded with a free register account from either nasa's data search delivery system or from the usgs earth explorer delivery system as we know already the aster sensor has 14 different bands is this bounce over here and as you can see the weight land is increasing from band b1 to band 14 and we can divide the bands in three different groups according to the pixel resolution let's go to see [Music] the first package is this one where we have the shortest white lens and also the biggest pixel resolution the second package is this one and this package is known as a sure wave infrared and here we have the intermediate wavelength and the pixel resolution it's a 30 by 30. and the last package is this one where we have the longest wavelengths and it's known as a long wave infrared or thermal infrared and the pixel resolution in this case is 90 by 90. as we know the this package is stopped to work properly in april 2008 however the spill event in burnaby occurred in 2007 then it means that we are going to work with all the bands as i indicated previously we have a couple of options to download the satellite images the nasa's earth data search delivery system and also the usgs earth explorer delivery system we are going to use the second option this is the usgs website then press the button login create a new account i created already then sync in and now we are going to use these tabs here to do the search then here at the first step we are going to leave the jail color by default fiat your g and i s then here we are going to put wall features and here we are going to put the name of the city that it's burnaby then show and it's the first option burnaby canada then click on burnaby and this this is our location then we are going to select the polygon the investigated area is this area over here and i'm going to make a polygon then just make a click another click there is one here i would like to move over here and also here i can make even this one smaller just to be more accurate this is approximately the interested area then the next step is to add the data range just go here first month day and year as we know the spill occurs in july 2007 we are going to add that range from zero seven to first 2007 and here is going to be 0 7 [Music] 30 2007 then here we are going to add just the july and now about the other options we are not going to do anything we are going to leave like that and now we are going to [Music] move to the next tab and here we are going to add aster and we are going to select the first option aster level 1t then as you can see it's already marked and there are additional criteria that you can check if you want but we are not going to do anything with this one and then we can go to results and what we get is just one satellite image and the good thing about this image is that this image was took one day after the spill the spill occurs on july 24th and the image is from july 25. now let's go to see some of these items here at the bottom the first one show more or less what is the location of the satellite image but that's not the exact location the exactly location it's with the next icon this one this one indicates where the satellite image is located exactly then we can make zoom we can take this one out at the moment look for our location or what location is over here right as you can see here the red one it's integrated inside the the image as you can see when we add the other option that's the important thing also we can click on the image and the metadata is going to be loaded we have the some information here as you can see there are a lot of information and also we can click on the image to have a better resolution of this image over here to download the image just click this option over here [Music] and select a standard product it's the first option then it's going to ask for the password again press okay [Music] and here okay and it start to download the image the image is already downloaded and now it's time to to process it the file i get is this one as you can see here we have the month the date and also the year easy as one one file also i created a folder the name is reflectance where i'm going to save the data that i'm going to process now in that folder then we have to go to quantum gis that's the software we are going to use to process the satellite image and we are going to use the plugin scp this plugin here in order to get this plugin you have to go to plugins manage and install plugins look here for scp as i did already scp and then make sure you mark this uh plugin and then install then when you have the plugin go here and select the option processing and it's going to be aster [Music] then select this icon over here open file look for your folder and then select the file [Music] open and as you can see the vans are already added over here [Music] also the pixel resolution for each of the bands and we have also additional information over here related with the metadata the day the sun elevation the earth sun distance the utm sun and other parameters also we have here the unit conversion coefficient because what the software is going to do now it's convert the information that we have at the satellite image the information is a digital number and that digital number is going to be converted in reflectance then here we can select different options we are going to check this one and this one we are not going to create any one at the moment and also we can leave this one by default and also this one and then press the button run and select the folder you created in my case i created the reflectance then select folder and leave the software to process the image that one is going to take a little bit of time when you hear that noise that indicates the process is already completed also as you can see all the layers has been low added at this panel let's go to see a little bit made this one bigger and we have the bands from 1 to 14 then we can take this one out for example and now we can visualize the the bands independently for example band 14 is this one band one is this one and remember that these three bands one one two and three the pixel resolution is uh 15 meters we are we are working now with these three bands and the pixel resolution is uh 15 meters four four five six seven eight and nine is 30 meters okay this one's from this one to the number nine to this one is 30 meters and from this one to this one it's a 90 meters [Music] as you can see over here and also here we can see the range of the reflectance for each band for example for the band one the reflectance go from this value to this value and even if we may consume here for example to see the pixels let me load the [Music] google satellite image here and this one here let's go to our location [Music] and there is one mark here okay our location [Music] it's over here [Music] right here [Music] and now let's go to put on the top the the first button this one and as you can see here it's pixel it's a 15 meters that it's very important from here to here as you can see there 15 meters and from here to here also 15 meters okay close and that is going to happen for band 2 and also band 3. but what happened with bam 4 if we change to band 4 now the pixel resolution change because here the pixel resolution is 30 meters we can calculate that one from here to here we have 30 meters and from here to here we have 30 meters okay and also if we calculate it for example for band 13 now the pixel resolution it's 90 meters if we take this pixel for example from here to here that's 90 meters and from here to here it's 90 meters okay it says 89 and 91 because i did approximately about it's 90 by 90. close also if we select this option here identify features and we click on a pixel we are going to see the reflectance value for example in this case you can see 0.053 for this pixel is changing and also and we can do that one also with other different bands for example for band one if you press here you can see the values for the reflectance for each pixel i would like to show you what kind of file we get inside this folder reflectance that's all the bands as you can see this is a raster images and it's a tiff file it means that the the image it's a geo reference and if you want to open this one without quantum gis you can use this software this is a free software that you can download it without paying anything then double click here and you can open the image but it takes a little bit of time [Music] that's the image and then you can be soon whatever you want this is the end of this uh first part and i'm going to leave for the second part the analysis of the spectral signatures related with the oil spill but i would like to tell you on my channel i have three videos related with satellite imageries is this one this one and this one that if you are interested and you want to learn more about this topic you can check it the first one it's related more in general about the different satellites and the different characteristics of each satellite and also it is about the band compositions the second one is related with the spectral signatures and the third one is how we can make a cartography based on the information from the satellite imagery and in most of the cases these three videos are related with the images from the sentinel but that's really good right because uh sentiment also it's a free satellite imageries and also the pixel resolution it's bigger and also the the periodicity of the image it's really good and you have uh satellite image uh pretty often a new ones i mean okay thank you very much for watching and see you on the next video [Music] [Applause] [Music] foreign

Channel: Geo RGB

Views: 1,404

Keywords: remote sensing tutorial, ASTER Satellite image, ASTER Satellite imagery, Environmental Monitoring, Processing satellite images, Oil spill image, Oil Spectral signature, QGIS oil spill, QGIS ASTER satellite, QGIS satellite images, QGIS remediation, QGIS analysis satellite, Analysis spectral signature, QGIS load image, QGIS satellite, QGIS hydrocarbons, QGIS ASTER, QGIS processing satellite, Remote sensing analysis, Geo RGB, Hydrocarbons Impact Map, QGIS Soil Cantamination

Id: eF2nswp6WmA

Length: 22min 52sec (1372 seconds)

Published: Mon Nov 16 2020