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Radar and topography

Radar has also been used to create topographic data of the Earth’s surface. This is invaluable to archaeologists, whether for mapping or finding new sites, or for understanding the wider …

Synthetic aperture radar (SAR)

Synthetic aperture radar (or SAR) is the most common type of radar system used in remote sensing that can produce imagery similar to the multispectral images we covered in Week …

What is radar?

Now we are going to introduce you to remote sensing with radar. Last week we noted that only visible light, infrared radiation and radio waves can pass through the atmosphere, …

NDVI in QGIS

Normalised difference values are not included when you download multispectral imagery, but they are fairly easy to calculate yourself! We are now going to create an NDVI raster using our …

Other multispectral imagery sources

Landsat 8 & 9 aren’t the only sources of multispectral imagery that you can download and use for free. In this section we will give you a quick summary of …

Landsat 8 & 9 imagery in QGIS

Now that you have your satellite imagery, let’s get it into QGIS! Adding our image to QGIS Before we open our imagery in QGIS we will need to extract it. …

Landsat 8 & 9 and EarthExplorer

Now that you have a background of what multispectral imagery is, and how it can be of use to archaeologists, let’s try creating some false colour images! Landsat 8 & …

Why do archaeologists care?

As you’ve now seen, we can create spectacular pictures using multispectral imagery – but what use is this to archaeologists? In this step we’ll show you how it can be …

Visualising multispectral imagery

We’ve just explored how we can use satellites to collect data on some parts of the electromagnetic spectrum that we cannot see ourselves. At this point you might ask “if …

Sentinel-2 imagery in QGIS

Adding raster data Now that we know the basics of QGIS, we can add our Sentinel-2 imagery. You can continue on with your “World Map” project or start a new …

Introducing the QGIS program

Last week we told you a little bit about QGIS and why we are using this particular GIS software. Hopefully, you have had a chance to download and install the …

Satellite imagery

An imaging satellite works in a similar way to a digital camera. Light from the sun is reflected by the Earth and so travels back into space to pass into …

Finding Sentinel-2 imagery

Now that we’ve covered the principles, let’s start learning how to use satellite imagery! We’ll start with finding and downloading imagery from the internet. For this exercise, we’ll be using …