Beijing-1 small satellite was launched in October 2005.It includes two sensors

32m three bands multispectral（green

red and near-infrared）and 4m panchromatic.Its revisiting period is very short

which was planned about 3—5 days depending on latitude at 32m resolution.Another important advantage of this satellite is the large area collection capability of 32m multispectral image

600km width imaging swath and more than 4000km stripe.These allow us to efficiently collect a large amount of imagery data

covering every region of the world.Due to the advantages of 32m multispectral image

it is obviously suitable for mapping

especially for large area

such as the whole country of China.So Beijing-1 small satellite will challenge the predominant role of satellite image data

such as TM and SPOT in Chinese large-area mapping work.Beijing-1 small satellite ground station is the first one in China that integrates satellite supervising and controlling

task planning

data acquisition

data preprocessing and mosaic

etc.Because of the incorporate working mode

the image data of Beijing-1 small satellite was obtained and processed.By the date of Nov.20th 2006

the obtained image data has more than 1000 orbits

which covers the whole country of China

and about 20 times for some area.Based on the abundant image data

the study of China’s digital mosaic map of Beijing-1 small satellite was promoted.This paper introduces the methods of image enhancement

geometric correction

image mosaic

and color adjustment

which led to a successful China’s digital mosaic map based on multispectral images of Beijing-1 small satellite.As to image preprocessing

destriping

band registration and MTF restoration was applied.Moreover

in order to improve the quality and efficiency

data preprocessing and geometric correction was done on every orbit.During the color adjustment

the image data was divided into many rectangle cells with the same area

with overlapping area between any joined cells.In practice

the data cell was 17125 pixel 17700 pixel

about 870MB

with 1000 pixel overlapping between any joined cells.There are 53 cells covering the land of China.Due to same small cells

it was obviously to decrease the cost of hardware for data processing

to improve the effect of color adjustment.According to the above mentioned approach

it will take less than half a year to obtain the Beijing-1 small satellite image data covering the whole country of China

and then only two months are needed to finish the whole mosaic work.As the result of study

by Dec.2006

two pieces of digital mosaic image of China has been achieved.The digital mosaic map is being and will be used in many fields

such as forest monitoring

land use and land cover change study

resource research

digital mapping and so on.Moreover

the experience to achieve the 32m mosaic image map is useful for other similar projects.