PROBLEM TO BE SOLVED: To provide a landform display system capable of displaying a terrain of the bottom of water in an easy-to-see manner by utilizing a general-purpose communication terminal device.SOLUTION: A landform display system includes: a portable type communication terminal device 5 having an imaging device 1, a display 2, own position measuring means 3 and imaging direction measuring means 4 of the imaging device 1 and a server device 7 having input means 6 for receiving own position measuring information and imaging direction measuring information from the portable type communication terminal device 5. The server device 7 includes: a three-dimensional database 9 storing a three-dimensional landform model in which a terrain of the bottom of water is modeled in a water region and a projection drawing generation means 10 for generating a center projection drawing which defines own position measuring information inside the input means 6 from the three-dimensional landform model and imaging direction measuring information as a view point position and a projection direction. The center projection drawing is transmitted to a portable type communication terminal device 5, and the portable type communication terminal device 5 displays in a display 2 by screen switching means 12 the center projection drawing outputted from the output means 11 of the server device 7 in replacement of the acquisition image by the imaging device 1.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】汎用の通信端末機器を利用して水底地形を分かりやすく表示可能な地形表示システムの提供。【解決手段】撮像装置1、ディスプレイ2、自位置計測手段3、および撮像装置1の撮影方向計測手段4を備えた携帯型通信端末装置5と、携帯型通信端末装置5から自位置計測情報、および撮影方向計測情報を受信する入力手段6を備えたサーバ装置7とを有し、サーバ装置7は、水域においては水底地形がモデル化された3次元地形モデルを格納した3次元地形データベース9と、3次元地形モデルから入力手段6内の自位置計測情報、および撮影方向計測情報を視点位置、および投影方向とする中心投影図を生成する投影図生成手段10と、中心投影図を携帯型通信端末装置5に送信し、携帯型通信端末装置5は、画面切換手段12により、サーバ装置7の出力手段11から出力される中心投影図を撮像装置1による取得画像に代えてディスプレイ2に表示する。【選択図】図1
