The Main Applications Of Remote Sensing For Agriculture
PEIYU GAO

Abstract: With the development of science and technology in agriculture, agricultural science also experienced from traditional agriculture to modern agriculture gradually transformed. Remote sensing has been commonly considered as an effective technique for agriculture.This paper study that the main application of remote sensing for agriculture.
Key words: satellite image, sensor, agriculture.

Introduction
With increasing population pressure throughout the world and the need for increased agricultural production there is a definite need for improved management of the world’s agricultural resources. Remote sensing and GIS(Geographic Information System) play the important role in agriculture. “Remote sensing is the acquiring of data about object without touching it.” By using sensor on airport,satellite to collect information and data for ground. So we can get a wide range of data and information.
The applications of remote sensing for agriculture including three parts--crop monitoring,resource monitoring and disaster monitoring.This paper will study applications for agriculture from three parts--crop monitoring,resource monitoring and disaster monitoring.

Content
1. Crops Monitoring
Crops monitoring including crop acreage monitoring, crop growth monitoring and so on. For crop acreage monitoring, different crops display different attribute that different color, shape and veins in satellite image. By using software or other ways to get information.It is benefit for research of scientist. On the other hand, getting crop acreage monitoring is basic for crops growth monitoring. Crop growth monitoring is monitor the growth of seedling. Different crops have different growing in different developmental stages.
1.1 Crop acreage monitoring
The advantages of remote sensing about crop acreage monitoring is abundant information amount, acquiring quickly, saving time and low cost. The scientist can use remote sensing to know the whole country agricultural information. Then they can use software to analysis satellite image. It is benefit for department of agriculture to control agricultural market. So crop acreage monitoring is very important for country.
Like below picture showing that with time going on, different crops have different growing information.

It is clear that crops growing information at every month. The scientist use the satellite image to calculate acreage of different crops. On the other hand, with time going on, the red area is increase, it is meaning that this area is good at cotton growing, and farmer’s income depend on the cotton production.

The upper two pictures represent that agricultural scholar analysis the satellite image then get the acreage of crops map and bar chart about yield in Pennsylvania between 2008 and 2013. Compare tow years, we known that crop planting area and sorts didn’t change in past five years. But from bar chart, we known that the number of deciduous forest decreased from 2008 to 2013.

1.2Crop growth monitoring
Crop growth is critical agricultural information.It can be used in the scientific management of crop and agricultural practice. It is also important in yield estimation and prediction. There are several methods for crop growth monitoring, including crop growth diagnostic model and remote sensing method. Remote sensing indicators are widely used in vegetation monitoring.

By using different length of reflective to get data the calculate LAI, then analysis growth of crops. We can also use specific value of two wavelength ranges reflective which is visible region of 0.6~0.7mm and near infrared of 0.75~1.00mm to predict growth of crops. The large value represent good growth, whereas poor growth.

2. Resource monitoring

Remote sensing can quickly obtain quantity of farm land, grassland, water and other natural resources. It provides the data sets for agricultural resources development,and agricultural