Intervalic Improvisation The Modern Sound: A Step Beyond Linear Improvisation by Walt Weiskopf is a book that provides an introduction to improvising using intervals.
Many jazz improvisors learn linear improvisation. Linear improvisation is basically learning what scale to play over various chord changes. For every scale there are one or more triad pairs that work or sound good over a particular chord.
This book works for all instruments.
Pages 4-19 of the book are used to derive triad pairs from the major scale, harmonic minor scale, melodic minor scale, diminished scale, harmonic major scale, whole tone scale and augmented scale. Pages 24-93 include exercises and patterns. The last section of the book contains etudes that provide examples of how intervalic improvisation can be used.
This is a very good book that I suggest that you study.
You can purchase the book from the following:
While you are at it you should also consider some of Walt’s music. Walt is an awesome player!