How would you manage your farm?

You are the owner of a 10000 acre farm, and you are growing many different crops in your farm…

You want to check your corn, what would you do?

A Go to the field by yourself

B Use remote sensing tools

C I don’t care

Opps

There is a drought happening in your farm but you don’t know anything about it. All of your crops are died

You go to the field

After you checked every corn field and came back home 5 days later, you found out you need to go to the field again to check your wheat

You found out you have many options, what would you choose?

A Use Google Earth

B Use aerial photos

C Use satellite images

I have seen my farm but…

What happened? My

corn is still green!

Google Earth use satellite images but it is updated in a very low frequency (The image shown was captured in 2012), or in another word, it has a very low temporal resolution. Hence it is not a valid way of monitoring your crops using Google Earth

You decide to use aerial photos

You contact a aerial photography company and get a very high-resolution image of your farm taken.

You checked everything and they are all in perfect condition.

One week after…

You received a bill from the aerial photography company

You decide to use satellite images

You found out that when you displayed the satellite image, there are many “bands” available. You chose to display

A True color image

B False color image

C Something amazing

True color image

True color image is displaying red stuff as red, green as green and blue as blue, i.e. the color in real world.You checked your crops in true color image, but you are not sure if they are all healthy or not, since they all appear to be green.

False color image

False color image use blue to displayed green stuff, red to display blue, and red to display Near Infrared (NIR, an invisible type light but can be captured by sensors). Sounds confusing, but actually it would be very helpful to you.

In this case, your healthy crops would be appears to be bright red because it reflects lots of NIR back to the sensor. While the unhealthy crops will have a colordarker

You can not only display bands in different combination, but also use it to produce more complicated image which would be able to describe the health condition of your crops more accurately.

Something amazing

NVDI

NDVI is Normalized Difference Vegetation Index.. It is calculated by using Near Infrared and red light reflectance. It would be a better indicator of healthy crops.

NVDI

Now you have learned how to monitor your farm properly

Ready for the harvest?