From 7ecf77dc38234437a8a83bde5e08bbef96a2a2e4 Mon Sep 17 00:00:00 2001
From: Micah <micahnyc@gmail.com>
Date: Thu, 6 Aug 2020 16:58:40 -0400
Subject: [PATCH] fix a bug in rawtilereader causing less map layers to be read

---
 modules/globebrowsing/src/rawtiledatareader.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/globebrowsing/src/rawtiledatareader.cpp b/modules/globebrowsing/src/rawtiledatareader.cpp
index a602008e1a..43791302ea 100644
--- a/modules/globebrowsing/src/rawtiledatareader.cpp
+++ b/modules/globebrowsing/src/rawtiledatareader.cpp
@@ -564,7 +564,7 @@ void RawTileDataReader::initialize() {
     const int numOverviews = _dataset->GetRasterBand(1)->GetOverviewCount();
     _maxChunkLevel = static_cast<int>(-tileLevelDifference);
     if (numOverviews > 0) {
-        _maxChunkLevel += numOverviews - 1;
+        _maxChunkLevel += numOverviews;
     }
     _maxChunkLevel = std::max(_maxChunkLevel, 2);
 }