CAJ | 학술논문

地理信息公共服务通过云平台进行部署和发布，可以使得其应用于政府部门和社会的空间数据服务更加高效和稳定。然而，把对应的地图信息挂载在云平台供应商处同时也加大了防止电子地图被盗用的难度。本文针对“天地图?广东”的电子地图瓦片，提出了一种具有高鲁棒性、基于离散余弦变换(DCT)的数字水印算法，在寄存云端和公开发布的电子地图中隐藏生产单位版权的数字水印图片，藉此来跟踪、抵制“天地图”图片数据的非法流通，非法复制，有效地保护数据生产单位的合法权益。
지리신식공공복무통과운평태진행부서화발포，가이사득기응용우정부부문화사회적공간수거복무경가고효화은정。연이，파대응적지도신식괘재재운평태공응상처동시야가대료방지전자지도피도용적난도。본문침대“천지도?엄동”적전자지도와편，제출료일충구유고로봉성、기우리산여현변환(DCT)적수자수인산법，재기존운단화공개발포적전자지도중은장생산단위판권적수자수인도편，자차래근종、저제“천지도”도편수거적비법류통，비법복제，유효지보호수거생산단위적합법권익。
Nowadays, The services of Public Geographic Information System are more stable and effective by means of the cloud technology. Somehow, it causes more difficulties for protected the electronic map data be stolen since the map data need to be uploaded to the cloud service provider. In this paper, a novel watermark solution with high robustness is proposed to applied in the GIS public version of Guangdong province, namely"Tianditu·Guangdong". The solution is based on Discrete Cosine Transform (DCT), embed the watermark of map producer into the map to prevent illegal circulation and protect intellectual property rights. .