From de4aead2193c9b334413f86d4c1c43441b0d52a6 Mon Sep 17 00:00:00 2001
From: zh <972939975@qq.com>
Date: Tue, 19 Aug 2025 10:58:07 +0800
Subject: [PATCH] =?UTF-8?q?=E8=A7=A3=E5=86=B3=E9=80=9A=E8=A7=86=E5=88=86?=
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---
 src/Obj/Analysis/Visibility/index.js | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/Obj/Analysis/Visibility/index.js b/src/Obj/Analysis/Visibility/index.js
index a7e44cd..0f115ce 100644
--- a/src/Obj/Analysis/Visibility/index.js
+++ b/src/Obj/Analysis/Visibility/index.js
@@ -63,11 +63,15 @@ class VisibilityAnalysis extends Tools {
         that.tip.set_text("左键创建视角终点，右键结束通视分析")
         if (!that.resultObject.viewPoint) {
           let pos84 = that.cartesian3Towgs84(cartesian, that.viewer)
-          let positions = await Cesium.sampleTerrainMostDetailed(
-            that.sdk.viewer.terrainProvider,
-            [Cesium.Cartographic.fromDegrees(pos84.lng, pos84.lat)]
-          );
-          if (positions[0].height > pos84.alt) {
+          let positions
+          if(that.sdk.viewer.terrainProvider.availability)
+          {
+            positions = await Cesium.sampleTerrainMostDetailed(
+              that.sdk.viewer.terrainProvider,
+              [Cesium.Cartographic.fromDegrees(pos84.lng, pos84.lat)]
+            );
+          }
+          if (positions && positions[0].height > pos84.alt) {
             pos84.alt = positions[0].height
           }
           pos84.alt = pos84.alt + that.viewPointHeight