Remote sensing data sources
I continue a series of articles about geoinformation technologies. Today we will talk about the sources of remote sensing data - images from satellites that are freely available on the Internet
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One of the sources was already considered in the previous article “Let's talk about GIS” - zulu.ssc.nasa.gov/mrsid/mrsid.pl , so I will not repeat. This source is quite simple and intuitive to use resource, providing images from US satellites Landsat.
Pictures of these satellites are provided by the Global Land Cover Facility resource.
When entering the site, we see a rather simple design with such an important button Download Data in the upper right part of the site.
Having reviewed the site and its contents, click the button. Unfortunately, at the time of writing the article, this useful section of the resource refused to open, but the fact that it works (albeit with interruptions) is for sure, just yesterday I visited it. Let's try to come in later and try your luck. In the meantime, let's move on to other equally useful sites.
The next in my article will be Modis Rapid Response System , which displays dangerous natural phenomena captured by the next American satellites Modis. At the time of this writing, one could see such a snapshot of the Central African region. Red dots are nothing but fires:
On the right image - Ob Bay. On the part of the territory covered by the photograph one can also observe fires.
In the gallery, you can also find pictures showing other natural phenomena - in addition to fires, hurricanes, tropical storms, typhoons, smoke, sandstorms are displayed ... Do not list everything. It is possible to choose a specific date (until April 2001) and see what phenomena were observed at one time or another on Earth.
Primary data Modis presented on the site http://eostation.scanex.ru/data/calendar.html . Choosing a date and one of the links we get a list of available layers - almost all of them are in the .hdf (Hierarchical Data Format) format, which, unfortunately, is not a convenient format.
After waiting some time, I still managed to go to the GLCF website. If you are lucky, press Map Search immediately. We see the following interface:
Then click on the map until the map frame covers the territory we need. Do not forget to put checkmarks in the left menu (by selecting the items you are interested in), press the select window button:
In the event that the area covered is too large or there are no images from the selected groups for this area, we will see something like the following
In the first case, we see the inscription 179 images in selection, while there is a link to the data download. In the second case, nothing of the kind is observed, there is only the inscription No images in selection.
Having achieved the desired result, click on the link Preview & Download. We are sent to the menu with a list of the data found, a thumbnail of the image in the upper left and the covered area on the map in the upper right:
By clicking on the ID of a menu item, we update the preview and scope. After selecting the most suitable snapshot, click on Info for more detailed information and on Download to get a list of files and their download.
Next, we consider a couple of resources of a slightly different focus - the data of the radar topographic survey of the Earth.
This section is opened by the http://edc.usgs.gov/products/elevation/gtopo30/gtopo30.html resource. Everything is simple and clear here - we click on the required section of the map, we get a preview with a link in the text (link of the form E020N90) - by link the archive with a series of files (the formats of the data provided are a conversation worthy of a separate article):
The main task is to display the relief of a particular territory. The pictures give a very detailed, detailed information about the relief.
I would not like to ignore the online map http://geofuse.geoeye.com/maps/Map.aspx . GeoEye allows for a sufficient approximation to impose pictures on Google map. Pressing the Search by current extent button, a menu will appear on the left with a series of shots that have fallen into this territory. By clicking the show all images button above the list or clicking on the corresponding icon next to the desired images, they instantly appear on the map:
I will note a couple of resources: these are the weather images , where at any time you can see actual information about the state of cloudiness. The base is constantly updated, the site has time for the next series of shots. In the animation section flash drives are available, showing the movement of clouds for a selected period of time.
The second resource and the last one in today's review is Cosmosnimki . The whole site, like the previous one, is in Russian, so it’s easy to understand it. An example of a snapshot from this resource:
Naturally, not all resources are covered in this article, but perhaps the most well-known and most useful ones are the majority. The web services offering mosaics of high and ultra high resolution images remained unaffected - this is the well-known GoogleEarth program (Google Earth) and its counterpart from NASA - WorldWind. If this topic is interesting to readers, then perhaps I will review WorldWind (Google’s creation, I think, does not require a presentation) in one of the following articles.
')
One of the sources was already considered in the previous article “Let's talk about GIS” - zulu.ssc.nasa.gov/mrsid/mrsid.pl , so I will not repeat. This source is quite simple and intuitive to use resource, providing images from US satellites Landsat.
Pictures of these satellites are provided by the Global Land Cover Facility resource.
When entering the site, we see a rather simple design with such an important button Download Data in the upper right part of the site.
Having reviewed the site and its contents, click the button. Unfortunately, at the time of writing the article, this useful section of the resource refused to open, but the fact that it works (albeit with interruptions) is for sure, just yesterday I visited it. Let's try to come in later and try your luck. In the meantime, let's move on to other equally useful sites.
The next in my article will be Modis Rapid Response System , which displays dangerous natural phenomena captured by the next American satellites Modis. At the time of this writing, one could see such a snapshot of the Central African region. Red dots are nothing but fires:
On the right image - Ob Bay. On the part of the territory covered by the photograph one can also observe fires.
In the gallery, you can also find pictures showing other natural phenomena - in addition to fires, hurricanes, tropical storms, typhoons, smoke, sandstorms are displayed ... Do not list everything. It is possible to choose a specific date (until April 2001) and see what phenomena were observed at one time or another on Earth.
Primary data Modis presented on the site http://eostation.scanex.ru/data/calendar.html . Choosing a date and one of the links we get a list of available layers - almost all of them are in the .hdf (Hierarchical Data Format) format, which, unfortunately, is not a convenient format.
After waiting some time, I still managed to go to the GLCF website. If you are lucky, press Map Search immediately. We see the following interface:
Then click on the map until the map frame covers the territory we need. Do not forget to put checkmarks in the left menu (by selecting the items you are interested in), press the select window button:
In the event that the area covered is too large or there are no images from the selected groups for this area, we will see something like the following
In the first case, we see the inscription 179 images in selection, while there is a link to the data download. In the second case, nothing of the kind is observed, there is only the inscription No images in selection.
Having achieved the desired result, click on the link Preview & Download. We are sent to the menu with a list of the data found, a thumbnail of the image in the upper left and the covered area on the map in the upper right:
By clicking on the ID of a menu item, we update the preview and scope. After selecting the most suitable snapshot, click on Info for more detailed information and on Download to get a list of files and their download.
Next, we consider a couple of resources of a slightly different focus - the data of the radar topographic survey of the Earth.
This section is opened by the http://edc.usgs.gov/products/elevation/gtopo30/gtopo30.html resource. Everything is simple and clear here - we click on the required section of the map, we get a preview with a link in the text (link of the form E020N90) - by link the archive with a series of files (the formats of the data provided are a conversation worthy of a separate article):
- E020N90.DEM
- E020N90.DMW
- E020N90.GIF
- E020N90.HDR
- E020N90.PRJ
- E020N90.SCH
- E020N90.SRC
- E020N90.STX
The main task is to display the relief of a particular territory. The pictures give a very detailed, detailed information about the relief.
I would not like to ignore the online map http://geofuse.geoeye.com/maps/Map.aspx . GeoEye allows for a sufficient approximation to impose pictures on Google map. Pressing the Search by current extent button, a menu will appear on the left with a series of shots that have fallen into this territory. By clicking the show all images button above the list or clicking on the corresponding icon next to the desired images, they instantly appear on the map:
I will note a couple of resources: these are the weather images , where at any time you can see actual information about the state of cloudiness. The base is constantly updated, the site has time for the next series of shots. In the animation section flash drives are available, showing the movement of clouds for a selected period of time.
The second resource and the last one in today's review is Cosmosnimki . The whole site, like the previous one, is in Russian, so it’s easy to understand it. An example of a snapshot from this resource:
Naturally, not all resources are covered in this article, but perhaps the most well-known and most useful ones are the majority. The web services offering mosaics of high and ultra high resolution images remained unaffected - this is the well-known GoogleEarth program (Google Earth) and its counterpart from NASA - WorldWind. If this topic is interesting to readers, then perhaps I will review WorldWind (Google’s creation, I think, does not require a presentation) in one of the following articles.
Source: https://habr.com/ru/post/67378/
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