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Copyright of Journal of Remote Sensing is the property of Editorial Office of Journal of Remote Sensing & Science Publishing Co. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Ground deformation has a certain impact on the safety and stability of engineering construction, and is of great significance to engineering construction planning and geological disaster prevention. This paper uses the continuous observation of the Global Navigation Satellite System (GNSS) of Continual Operating Reference Station (CORS) network to realize the monitoring of regional ground height, ground gravity and ground tilt changes. Through the time and space analysis with part of the geological disaster information, it is determined the factors and weights used in the analysis of ground stability changes, and then quantitative analysis of ground stability changes. This method has been tested and verified in the southeast region of Zhejiang province, and good results have been obtained. Continuous observation using the CORS network can quantitatively monitor the changes of the entire surface of ground deformation, analyze changes in regional ground stability, and can provide technical support and reference for regional planning and geological disaster prevention.

Copyright of Chinese Journal of Geological Hazard & Control is the property of China Institute of Geological Environmental Monitoring (CIGEM) Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Ionosphere delay is the dominant error source of single frequency GPS ground deformation monitoring point coordinate precision，how to reduce the error source influence is the key point to enhance the precision of single and dual frequency mixed ground deformation monitoring system. Based on the data of Guangzhou Nansha single and dual frequency mixed GPS ground deformation monitoring network，analysis indicates that ionosphere delay influence is still large, even though the baseline length is short in low latitude region. The impact of ionosphere delay aggravates as baseline length increases，and the rule of seasonal change is quite obvious： significant in February, March, August and September. Dual frequency data is used to correct the ionosphere delay error in observation value domain, as a result，the precision is improved by 57 %，indicating that the effect of observation domain correction is obvious. [ABSTRACT FROM AUTHOR]