add logo properly

Author: MaxMLang

man/figures/logo.png

@@ -27,6 +27,7 @@ hexsmoothR implements hexagonal grid-based spatial smoothing algorithms optimize
 ## Hexagonal Grid Advantages
 
 Hexagonal grids offer several technical advantages for spatial analysis:
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 - Six neighbors per cell vs. four in square grids
 - Eliminates diagonal artifacts and edge effects
 - Improved packing efficiency and uniform cell shapes
@@ -35,6 +36,7 @@ Hexagonal grids offer several technical advantages for spatial analysis:
 ## Coastal Data Demonstration
 
 Coastal vegetation data demonstrates hexagonal smoothing effectiveness:
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 - Complex, irregular shorelines challenging traditional grid methods
 - Natural noise from water interference, cloud cover, and sensor issues
 - Underlying environmental patterns suitable for spatial enhancement
@@ -43,6 +45,7 @@ Coastal vegetation data demonstrates hexagonal smoothing effectiveness:
 ## Workflow Overview
 
 The complete hexagonal smoothing workflow:
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 1. Data preparation and validation
 2. Hexagonal grid creation with appropriate cell sizing
 3. Raster data extraction into hexagonal cells
@@ -59,6 +62,7 @@ The demonstration uses original Sentinel-2 data without artificial noise, demons
 ## Algorithm Implementation
 
 The hexagonal smoothing algorithm implements weighted neighbor averaging:
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 - First-order neighbors: Directly adjacent hexagons
 - Second-order neighbors: Neighbors of first-order neighbors
 - Weighted averaging: Center cell and neighbors contribute according to specified weights
@@ -71,6 +75,7 @@ The following sections provide implementation examples and technical details for
 ### Coordinate Reference Systems (CRS)
 
 CRS selection affects hexagonal grid accuracy and cell sizing:
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 - Projected CRS (UTM, State Plane): cell_size in meters
 - Geographic CRS (WGS84, NAD83): cell_size in degrees
 - Package handles CRS transformations automatically
@@ -206,6 +211,7 @@ Grid creation requires appropriate cell sizing and coordinate system selection.
 ### Cell Size and CRS Dependencies
 
 Cell size units depend on coordinate reference system:
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 - Projected CRS (UTM, State Plane): cell_size in meters
 - Geographic CRS (WGS84, NAD83): cell_size in degrees