based on data maintenance

Data maintenance

maintenance data depot

basic data

basic data bank for emergency response

basic data for design

Basic data for substitution

basic data settlement

Basic data system

basic data type

GIS basic data

nautical basic data

convesion of curved-surface data into borizontal-plane data

data processing for piecing together various 3 D data sets

ratio of test data to design data

seismic data transmission data

test data and the highest data

2-level maintenance

3 level maintenance tset

accelerate maintenance