code: function (sector, tileMatrix, row, column, imagePath) {
              this.sector = sector;
              this.tileMatrix = tileMatrix;
              this.row = row;
              this.column = column;
              this.imagePath = imagePath;
  
              this.texelSize = (sector.deltaLatitude() * Angle.DEGREES_TO_RADIANS) / tileMatrix.tileHeight;
  
              this.tileKey = tileMatrix.levelNumber.toString() + "." + row.toString() + "." + column.toString();
  
              this.gpuCacheKey = imagePath;
          }
docs: This is an internal class and is intentionally not documented.