"Between these ridges, and along their slopes, that is, in front of the Second and Third Corps, the ground is cultivated, and is covered with fields of wheat, now nearly ripe, with grass and pastures, with some peach orchards, with fields of waving corn, and some farm houses, and their out buildings along the Emmetsburg road. There are very few places within the limits mentioned where troops and guns could move concealed. There are some oaks of considerable woods immediately in front of the right of the Second Corps, a group of small trees, sassafras and oak, in front of the right of the Second Division of this Corps also; and considerable woods immediately in front of the left of the Third Corps, and also to the West of, and near Round Top." -Frank Haskell, The Battle of Gettysburg
Physical geography can defined as the branch of geography concerned with the natural features and phenomena of the earth's surface, such as landforms, drainage features, climates, soils and vegetation. The physical geography of Gettysburg might have had the greatest effect on the Battle of Gettysburg, specifically, the land of Gettysburg.
Land Cover The land of Gettysburg probably had the greatest effect on the battle.
Climate Considering when the battle took place, the climate of Gettysburg also helped the Union win the battle.